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#1 2020-05-13 06:39:44

chrisco23
Member
Registered: 2017-12-13
Posts: 156

[SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

I have the Logitech C920 USB webcam (HD Pro, a popular model).

Everything works fine in Windows but on my fully-updated Arch Linux desktop, the audio comes out as just screeching noise for the other party.

I've tried playing around with pavucontrol, but as near as I can tell, there is no driver for Linux, and v4s-utils apparently only allows video tweaking, I'm out of ideas.

I really really don't want to have to use Windows for my various quarantine webcam needs, especially since at some point I'll need to share my desktop, and only my Linux desktop will be relevant.

Can anybody think of anything else I can try for debugging?


Thanks!
Chris

Last edited by chrisco23 (2020-05-14 21:22:48)

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#2 2020-05-13 07:07:54

Awebb
Member
Registered: 2010-05-06
Posts: 6,688

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

Rule out Zoom as the problem. Record some audio with the mic.

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#3 2020-05-13 07:23:30

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 25,380

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

In addition to trying the above, post during an attempt at a recording 

sudo fuser -v /dev/snd/*
pacmd list-cards
pacmd list-sources
pacmd list-source-outputs

in [ code ] [ /code ]  tags

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#4 2020-05-14 04:05:10

chrisco23
Member
Registered: 2017-12-13
Posts: 156

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

Thanks for the responses.

The problem exists in both Zoom and Google Meet (and both work fine in Windows 7).

I recorded the webcam into audacity and found that the static is so bad that you can barely/almost make out my voice.

 sudo fuser -v /dev/snd/* > test.txt
                     USER        PID ACCESS COMMAND
/dev/snd/controlC0:  mpd       F.... mpd
                     mylinuxuser   F.... pulseaudio
                     mylinuxuser   F.... audacity
/dev/snd/controlC1:  mylinuxuser   F.... pulseaudio
/dev/snd/controlC2:  mylinuxuser   F.... pulseaudio
/dev/snd/controlC3:  mylinuxuser   F.... pulseaudio
/dev/snd/controlC4:  mylinuxuser   F.... pulseaudio
/dev/snd/pcmC0D1p:   mylinuxuser   F...m pulseaudio
/dev/snd/pcmC1D7p:   mylinuxuser   F...m pulseaudio
/dev/snd/pcmC2D0c:   mylinuxuser   F...m pulseaudio
/dev/snd/pcmC2D0p:   mylinuxuser   F...m pulseaudio
/dev/snd/pcmC3D0c:   mylinuxuser   F...m pulseaudio
/dev/snd/pcmC3D0p:   mylinuxuser   F...m pulseaudio
/dev/snd/pcmC4D0c:   mylinuxuser   F...m pulseaudio
/dev/snd/seq:        mylinuxuser   F.... pipewire
                     mylinuxuser   F.... audacity

pacmd list-cards:

$ cat w_list-cards.txt 
5 card(s) available.
    index: 0
        name: <alsa_card.pci-0000_04_00.1>
        driver: <module-alsa-card.c>
        owner module: 6
        properties:
                alsa.card = "1"
                alsa.card_name = "HDA NVidia"
                alsa.long_card_name = "HDA NVidia at 0xfbcfc000 irq 43"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:04:00.1"
                sysfs.path = "/devices/pci0000:00/0000:00:07.0/0000:04:00.1/sound/card1"
                device.bus = "pci"
                device.vendor.id = "10de"
                device.vendor.name = "NVIDIA Corporation"
                device.product.id = "0fba"
                device.product.name = "GM206 High Definition Audio Controller"
                device.string = "1"
                device.description = "GM206 High Definition Audio Controller"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5900, available: no)
                output:hdmi-surround: Digital Surround 5.1 (HDMI) Output (priority 800, available: no)
                output:hdmi-surround71: Digital Surround 7.1 (HDMI) Output (priority 800, available: no)
                output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (priority 5700, available: unknown)
                output:hdmi-stereo-extra2: Digital Stereo (HDMI 3) Output (priority 5700, available: no)
                output:hdmi-surround-extra2: Digital Surround 5.1 (HDMI 3) Output (priority 600, available: no)
                output:hdmi-surround71-extra2: Digital Surround 7.1 (HDMI 3) Output (priority 600, available: no)
                output:hdmi-stereo-extra3: Digital Stereo (HDMI 4) Output (priority 5700, available: no)
                output:hdmi-surround-extra3: Digital Surround 5.1 (HDMI 4) Output (priority 600, available: no)
                output:hdmi-surround71-extra3: Digital Surround 7.1 (HDMI 4) Output (priority 600, available: no)
                output:hdmi-stereo-extra4: Digital Stereo (HDMI 5) Output (priority 5700, available: no)
                output:hdmi-surround-extra4: Digital Surround 5.1 (HDMI 5) Output (priority 600, available: no)
                output:hdmi-surround71-extra4: Digital Surround 7.1 (HDMI 5) Output (priority 600, available: no)
                output:hdmi-stereo-extra5: Digital Stereo (HDMI 6) Output (priority 5700, available: no)
                output:hdmi-surround-extra5: Digital Surround 5.1 (HDMI 6) Output (priority 600, available: no)
                output:hdmi-surround71-extra5: Digital Surround 7.1 (HDMI 6) Output (priority 600, available: no)
                output:hdmi-stereo-extra6: Digital Stereo (HDMI 7) Output (priority 5700, available: no)
                output:hdmi-surround-extra6: Digital Surround 5.1 (HDMI 7) Output (priority 600, available: no)
                output:hdmi-surround71-extra6: Digital Surround 7.1 (HDMI 7) Output (priority 600, available: no)
                off: Off (priority 0, available: unknown)
        active profile: <output:hdmi-stereo-extra1>
        sinks:
                alsa_output.pci-0000_04_00.1.hdmi-stereo-extra1/#0: GM206 High Definition Audio Controller Digital Stereo (HDMI 2)
        sources:
                alsa_output.pci-0000_04_00.1.hdmi-stereo-extra1.monitor/#0: Monitor of GM206 High Definition Audio Controller Digital Stereo (HDMI 2)
        ports:
                hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-1: HDMI / DisplayPort 2 (priority 5800, latency offset 0 usec, available: yes)
                        properties:
                                device.icon_name = "video-display"
                                device.product.name = "HDMI
        "
                hdmi-output-2: HDMI / DisplayPort 3 (priority 5700, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-3: HDMI / DisplayPort 4 (priority 5600, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-4: HDMI / DisplayPort 5 (priority 5500, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-5: HDMI / DisplayPort 6 (priority 5400, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
                hdmi-output-6: HDMI / DisplayPort 7 (priority 5300, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "video-display"
    index: 1
        name: <alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00>
        driver: <module-alsa-card.c>
        owner module: 7
        properties:
                alsa.card = "2"
                alsa.card_name = "USB Audio CODEC"
                alsa.long_card_name = "Burr-Brown from TI USB Audio CODEC at usb-0000:00:1a.0-2, full speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.0-usb-0:2:1.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.0/usb5/5-2/5-2:1.0/sound/card2"
                udev.id = "usb-Burr-Brown_from_TI_USB_Audio_CODEC-00"
                device.bus = "usb"
                device.vendor.id = "08bb"
                device.vendor.name = "Texas Instruments"
                device.product.id = "2902"
                device.product.name = "PCM2902 Audio Codec"
                device.serial = "Burr-Brown_from_TI_USB_Audio_CODEC"
                device.string = "2"
                device.description = "PCM2902 Audio Codec"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
        profiles:
                input:analog-stereo: Analog Stereo Input (priority 65, available: unknown)
                input:iec958-stereo: Digital Stereo (IEC958) Input (priority 55, available: unknown)
                output:analog-stereo: Analog Stereo Output (priority 6500, available: unknown)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6565, available: unknown)
                output:analog-stereo+input:iec958-stereo: Analog Stereo Output + Digital Stereo (IEC958) Input (priority 6555, available: unknown)
                output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5565, available: unknown)
                output:iec958-stereo+input:iec958-stereo: Digital Stereo Duplex (IEC958) (priority 5555, available: unknown)
                off: Off (priority 0, available: unknown)
        active profile: <output:analog-stereo+input:analog-stereo>
        sinks:
                alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo/#1: PCM2902 Audio Codec Analog Stereo
        sources:
                alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo.monitor/#1: Monitor of PCM2902 Audio Codec Analog Stereo
                alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo/#2: PCM2902 Audio Codec Analog Stereo
        ports:
                analog-input: Analog Input (priority 10000, latency offset 0 usec, available: unknown)
                        properties:

                iec958-stereo-input: Digital Input (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

                analog-output: Analog Output (priority 9900, latency offset 0 usec, available: unknown)
                        properties:

                iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

    index: 3
        name: <alsa_card.pci-0000_00_1b.0>
        driver: <module-alsa-card.c>
        owner module: 9
        properties:
                alsa.card = "0"
                alsa.card_name = "HDA Intel"
                alsa.long_card_name = "HDA Intel at 0xf9df8000 irq 42"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "3a3e"
                device.product.name = "82801JI (ICH10 Family) HD Audio Controller"
                device.form_factor = "internal"
                device.string = "0"
                device.description = "Built-in Audio"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
        profiles:
                input:analog-stereo: Analog Stereo Input (priority 65, available: no)
                output:analog-stereo: Analog Stereo Output (priority 6500, available: no)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6565, available: no)
                output:analog-surround-21: Analog Surround 2.1 Output (priority 1300, available: no)
                output:analog-surround-21+input:analog-stereo: Analog Surround 2.1 Output + Analog Stereo Input (priority 1365, available: no)
                output:analog-surround-40: Analog Surround 4.0 Output (priority 1200, available: no)
                output:analog-surround-40+input:analog-stereo: Analog Surround 4.0 Output + Analog Stereo Input (priority 1265, available: no)
                output:analog-surround-41: Analog Surround 4.1 Output (priority 1300, available: no)
                output:analog-surround-41+input:analog-stereo: Analog Surround 4.1 Output + Analog Stereo Input (priority 1365, available: no)
                output:analog-surround-50: Analog Surround 5.0 Output (priority 1200, available: no)
                output:analog-surround-50+input:analog-stereo: Analog Surround 5.0 Output + Analog Stereo Input (priority 1265, available: no)
                output:analog-surround-51: Analog Surround 5.1 Output (priority 1300, available: no)
                output:analog-surround-51+input:analog-stereo: Analog Surround 5.1 Output + Analog Stereo Input (priority 1365, available: no)
                output:analog-surround-71: Analog Surround 7.1 Output (priority 1200, available: no)
                output:analog-surround-71+input:analog-stereo: Analog Surround 7.1 Output + Analog Stereo Input (priority 1265, available: no)
                output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5565, available: no)
                off: Off (priority 0, available: unknown)
        active profile: <output:iec958-stereo>
        sinks:
                alsa_output.pci-0000_00_1b.0.iec958-stereo/#3: Built-in Audio Digital Stereo (IEC958)
        sources:
                alsa_output.pci-0000_00_1b.0.iec958-stereo.monitor/#5: Monitor of Built-in Audio Digital Stereo (IEC958)
        ports:
                analog-input-front-mic: Front Microphone (priority 8500, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-rear-mic: Rear Microphone (priority 8200, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: no)
                        properties:

                analog-output-lineout: Line Out (priority 9000, latency offset 0 usec, available: no)
                        properties:

                analog-output-headphones: Headphones (priority 9900, latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-headphones"
                iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

    index: 6
        name: <alsa_card.usb-046d_HD_Pro_Webcam_C920_1629287F-02>
        driver: <module-alsa-card.c>
        owner module: 29
        properties:
                alsa.card = "4"
                alsa.card_name = "HD Pro Webcam C920"
                alsa.long_card_name = "HD Pro Webcam C920 at usb-0000:00:1a.7-1, high speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.7-usb-0:1:1.2"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.7/usb1/1-1/1-1:1.2/sound/card4"
                udev.id = "usb-046d_HD_Pro_Webcam_C920_1629287F-02"
                device.bus = "usb"
                device.vendor.id = "046d"
                device.vendor.name = "Logitech, Inc."
                device.product.id = "082d"
                device.product.name = "HD Pro Webcam C920"
                device.serial = "046d_HD_Pro_Webcam_C920_1629287F"
                device.form_factor = "webcam"
                device.string = "4"
                device.description = "HD Pro Webcam C920"
                module-udev-detect.discovered = "1"
                device.icon_name = "camera-web-usb"
        profiles:
                input:analog-stereo: Analog Stereo Input (priority 65, available: unknown)
                input:iec958-stereo: Digital Stereo (IEC958) Input (priority 55, available: unknown)
                off: Off (priority 0, available: unknown)
        active profile: <input:analog-stereo>
        sources:
                alsa_input.usb-046d_HD_Pro_Webcam_C920_1629287F-02.analog-stereo/#9: HD Pro Webcam C920 Analog Stereo
        ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
                iec958-stereo-input: Digital Input (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

    index: 7
        name: <alsa_card.usb-VIA_Technologies_Inc._USB_Audio_Device-00>
        driver: <module-alsa-card.c>
        owner module: 30
        properties:
                alsa.card = "3"
                alsa.card_name = "USB Audio Device"
                alsa.long_card_name = "VIA Technologies Inc. USB Audio Device at usb-0000:00:1a.2-2.4, full speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.2-usb-0:2.4:1.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.2/usb7/7-2/7-2.4/7-2.4:1.0/sound/card3"
                udev.id = "usb-VIA_Technologies_Inc._USB_Audio_Device-00"
                device.bus = "usb"
                device.vendor.id = "040d"
                device.vendor.name = "VIA Technologies, Inc."
                device.product.id = "340a"
                device.product.name = "USB Audio Device"
                device.serial = "VIA_Technologies_Inc._USB_Audio_Device"
                device.string = "3"
                device.description = "USB Audio Device"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
        profiles:
                input:analog-stereo: Analog Stereo Input (priority 65, available: unknown)
                input:iec958-stereo: Digital Stereo (IEC958) Input (priority 55, available: unknown)
                output:analog-stereo: Analog Stereo Output (priority 6500, available: unknown)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6565, available: unknown)
                output:analog-stereo+input:iec958-stereo: Analog Stereo Output + Digital Stereo (IEC958) Input (priority 6555, available: unknown)
                output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
                output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5565, available: unknown)
                output:iec958-stereo+input:iec958-stereo: Digital Stereo Duplex (IEC958) (priority 5555, available: unknown)
                off: Off (priority 0, available: unknown)
        active profile: <output:analog-stereo+input:analog-stereo>
        sinks:
                alsa_output.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo/#5: USB Audio Device Analog Stereo
        sources:
                alsa_output.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo.monitor/#10: Monitor of USB Audio Device Analog Stereo
                alsa_input.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo/#11: USB Audio Device Analog Stereo
        ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
                iec958-stereo-input: Digital Input (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

                analog-output-speaker: Speakers (priority 10000, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-speakers"
                iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
                        properties:

pacmd list-sources:

$ cat w_list-sources.txt 
7 source(s) available.
    index: 0
        name: <alsa_output.pci-0000_04_00.1.hdmi-stereo-extra1.monitor>
        driver: <module-alsa-card.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 1030
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 6 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        configured latency: 40.00 ms; range is 0.50 .. 1999.82 ms
        monitor_of: 0
        card: 0 <alsa_card.pci-0000_04_00.1>
        module: 6
        properties:
                device.description = "Monitor of GM206 High Definition Audio Controller Digital Stereo (HDMI 2)"
                device.class = "monitor"
                alsa.card = "1"
                alsa.card_name = "HDA NVidia"
                alsa.long_card_name = "HDA NVidia at 0xfbcfc000 irq 43"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:04:00.1"
                sysfs.path = "/devices/pci0000:00/0000:00:07.0/0000:04:00.1/sound/card1"
                device.bus = "pci"
                device.vendor.id = "10de"
                device.vendor.name = "NVIDIA Corporation"
                device.product.id = "0fba"
                device.product.name = "GM206 High Definition Audio Controller"
                device.string = "1"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
    index: 1
        name: <alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo.monitor>
        driver: <module-alsa-card.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 1040
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 6 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
        monitor_of: 1
        card: 1 <alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00>
        module: 7
        properties:
                device.description = "Monitor of PCM2902 Audio Codec Analog Stereo"
                device.class = "monitor"
                alsa.card = "2"
                alsa.card_name = "USB Audio CODEC"
                alsa.long_card_name = "Burr-Brown from TI USB Audio CODEC at usb-0000:00:1a.0-2, full speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.0-usb-0:2:1.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.0/usb5/5-2/5-2:1.0/sound/card2"
                udev.id = "usb-Burr-Brown_from_TI_USB_Audio_CODEC-00"
                device.bus = "usb"
                device.vendor.id = "08bb"
                device.vendor.name = "Texas Instruments"
                device.product.id = "2902"
                device.product.name = "PCM2902 Audio Codec"
                device.serial = "Burr-Brown_from_TI_USB_Audio_CODEC"
                device.string = "2"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
  * index: 2
        name: <alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 9049
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: yes
        current latency: 0.12 ms
        max rewind: 0 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
        card: 1 <alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00>
        module: 7
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "USB Audio"
                alsa.id = "USB Audio"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "2"
                alsa.card_name = "USB Audio CODEC"
                alsa.long_card_name = "Burr-Brown from TI USB Audio CODEC at usb-0000:00:1a.0-2, full speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.0-usb-0:2:1.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.0/usb5/5-2/5-2:1.0/sound/card2"
                udev.id = "usb-Burr-Brown_from_TI_USB_Audio_CODEC-00"
                device.bus = "usb"
                device.vendor.id = "08bb"
                device.vendor.name = "Texas Instruments"
                device.product.id = "2902"
                device.product.name = "PCM2902 Audio Codec"
                device.serial = "Burr-Brown_from_TI_USB_Audio_CODEC"
                device.string = "front:2"
                device.buffering.buffer_size = "352800"
                device.buffering.fragment_size = "176400"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "PCM2902 Audio Codec Analog Stereo"
                alsa.mixer_name = "USB Mixer"
                alsa.components = "USB08bb:2902"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
        ports:
                analog-input: Analog Input (priority 10000, latency offset 0 usec, available: unknown)
                        properties:

        active port: <analog-input>
    index: 5
        name: <alsa_output.pci-0000_00_1b.0.iec958-stereo.monitor>
        driver: <module-alsa-card.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 1030
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 6 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
        monitor_of: 3
        card: 3 <alsa_card.pci-0000_00_1b.0>
        module: 9
        properties:
                device.description = "Monitor of Built-in Audio Digital Stereo (IEC958)"
                device.class = "monitor"
                alsa.card = "0"
                alsa.card_name = "HDA Intel"
                alsa.long_card_name = "HDA Intel at 0xf9df8000 irq 42"
                alsa.driver_name = "snd_hda_intel"
                device.bus_path = "pci-0000:00:1b.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
                device.bus = "pci"
                device.vendor.id = "8086"
                device.vendor.name = "Intel Corporation"
                device.product.id = "3a3e"
                device.product.name = "82801JI (ICH10 Family) HD Audio Controller"
                device.form_factor = "internal"
                device.string = "0"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-pci"
    index: 9
        name: <alsa_input.usb-046d_HD_Pro_Webcam_C920_1629287F-02.analog-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 9049
        volume: front-left: 55940 /  85% / -4.13 dB,   front-right: 55940 /  85% / -4.13 dB
                balance 0.00
        base volume: 9619 /  15% / -50.00 dB
        volume steps: 65537
        muted: no
        current latency: 9.06 ms
        max rewind: 0 KiB
        sample spec: s16le 2ch 32000Hz
        channel map: front-left,front-right
                     Stereo
        used by: 2
        linked by: 2
        configured latency: 24.99 ms; range is 0.50 .. 2000.00 ms
        card: 6 <alsa_card.usb-046d_HD_Pro_Webcam_C920_1629287F-02>
        module: 29
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "USB Audio"
                alsa.id = "USB Audio"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "4"
                alsa.card_name = "HD Pro Webcam C920"
                alsa.long_card_name = "HD Pro Webcam C920 at usb-0000:00:1a.7-1, high speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.7-usb-0:1:1.2"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.7/usb1/1-1/1-1:1.2/sound/card4"
                udev.id = "usb-046d_HD_Pro_Webcam_C920_1629287F-02"
                device.bus = "usb"
                device.vendor.id = "046d"
                device.vendor.name = "Logitech, Inc."
                device.product.id = "082d"
                device.product.name = "HD Pro Webcam C920"
                device.serial = "046d_HD_Pro_Webcam_C920_1629287F"
                device.form_factor = "webcam"
                device.string = "front:4"
                device.buffering.buffer_size = "256000"
                device.buffering.fragment_size = "128000"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "HD Pro Webcam C920 Analog Stereo"
                alsa.mixer_name = "USB Mixer"
                alsa.components = "USB046d:082d"
                module-udev-detect.discovered = "1"
                device.icon_name = "camera-web-usb"
        ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
        active port: <analog-input-mic>
    index: 10
        name: <alsa_output.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo.monitor>
        driver: <module-alsa-card.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 1040
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 6 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
        monitor_of: 5
        card: 7 <alsa_card.usb-VIA_Technologies_Inc._USB_Audio_Device-00>
        module: 30
        properties:
                device.description = "Monitor of USB Audio Device Analog Stereo"
                device.class = "monitor"
                alsa.card = "3"
                alsa.card_name = "USB Audio Device"
                alsa.long_card_name = "VIA Technologies Inc. USB Audio Device at usb-0000:00:1a.2-2.4, full speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.2-usb-0:2.4:1.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.2/usb7/7-2/7-2.4/7-2.4:1.0/sound/card3"
                udev.id = "usb-VIA_Technologies_Inc._USB_Audio_Device-00"
                device.bus = "usb"
                device.vendor.id = "040d"
                device.vendor.name = "VIA Technologies, Inc."
                device.product.id = "340a"
                device.product.name = "USB Audio Device"
                device.serial = "VIA_Technologies_Inc._USB_Audio_Device"
                device.string = "3"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
    index: 11
        name: <alsa_input.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: RUNNING
        suspend cause: (none)
        priority: 9049
        volume: front-left: 65535 / 100% / -0.00 dB,   front-right: 65535 / 100% / -0.00 dB
                balance 0.00
        base volume: 20724 /  32% / -30.00 dB
        volume steps: 65537
        muted: yes
        current latency: 0.00 ms
        max rewind: 0 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        configured latency: 40.00 ms; range is 0.50 .. 2000.00 ms
        card: 7 <alsa_card.usb-VIA_Technologies_Inc._USB_Audio_Device-00>
        module: 30
        properties:
                alsa.resolution_bits = "16"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "USB Audio"
                alsa.id = "USB Audio"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "3"
                alsa.card_name = "USB Audio Device"
                alsa.long_card_name = "VIA Technologies Inc. USB Audio Device at usb-0000:00:1a.2-2.4, full speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:1a.2-usb-0:2.4:1.0"
                sysfs.path = "/devices/pci0000:00/0000:00:1a.2/usb7/7-2/7-2.4/7-2.4:1.0/sound/card3"
                udev.id = "usb-VIA_Technologies_Inc._USB_Audio_Device-00"
                device.bus = "usb"
                device.vendor.id = "040d"
                device.vendor.name = "VIA Technologies, Inc."
                device.product.id = "340a"
                device.product.name = "USB Audio Device"
                device.serial = "VIA_Technologies_Inc._USB_Audio_Device"
                device.string = "front:3"
                device.buffering.buffer_size = "352800"
                device.buffering.fragment_size = "176400"
                device.access_mode = "mmap+timer"
                device.profile.name = "analog-stereo"
                device.profile.description = "Analog Stereo"
                device.description = "USB Audio Device Analog Stereo"
                alsa.mixer_name = "USB Mixer"
                alsa.components = "USB040d:340a"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
        ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
        active port: <analog-input-mic>

pacmd list-source-outputs

$ cat w_list-source-outputs.txt 
8 source output(s) available.
    index: 174
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 0 <alsa_output.pci-0000_04_00.1.hdmi-stereo-extra1.monitor>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 29.70 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 175
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 1 <alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo.monitor>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 30.07 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 176
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 2 <alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 0.00 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 177
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 5 <alsa_output.pci-0000_00_1b.0.iec958-stereo.monitor>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 25.35 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 178
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 9 <alsa_input.usb-046d_HD_Pro_Webcam_C920_1629287F-02.analog-stereo>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 0.00 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 179
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 10 <alsa_output.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo.monitor>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 33.06 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 180
        driver: <protocol-native.c>
        flags: DONT_MOVE 
        state: RUNNING
        source: 11 <alsa_input.usb-VIA_Technologies_Inc._USB_Audio_Device-00.analog-stereo>
        volume: mono: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 0.00 ms
        requested latency: 40.00 ms
        sample spec: float32le 1ch 25Hz
        channel map: mono
                     Mono
        resample method: peaks
        owner module: 15
        client: 468 <PulseAudio Volume Control>
        properties:
                media.name = "Peak detect"
                application.name = "PulseAudio Volume Control"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.id = "org.PulseAudio.pavucontrol"
                application.icon_name = "audio-card"
                application.version = "4.0"
                application.process.id = "3205401"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "pavucontrol"
                application.language = "en_US.utf8"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
    index: 204
        driver: <protocol-native.c>
        flags: 
        state: RUNNING
        source: 9 <alsa_input.usb-046d_HD_Pro_Webcam_C920_1629287F-02.analog-stereo>
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        muted: no
        current latency: 0.00 ms
        requested latency: 24.99 ms
        sample spec: float32le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        resample method: speex-float-1
        owner module: 15
        client: 492 <ALSA plug-in [audacity]>
        properties:
                media.name = "ALSA Capture"
                application.name = "ALSA plug-in [audacity]"
                native-protocol.peer = "UNIX socket client"
                native-protocol.version = "33"
                application.process.id = "3190871"
                application.process.user = "fugbert"
                application.process.host = "arch-desktop"
                application.process.binary = "audacity"
                application.language = "C"
                window.x11.display = ":0"
                application.process.machine_id = "a3f7d86292dc451791484af114e097a2"
                application.process.session_id = "1"
                application.icon_name = "audacity"
                module-stream-restore.id = "source-output-by-application-name:ALSA plug-in [audacity]"

BTW, maybe there is a way to streamline some of this?

For this Arch desktop, I send all output to my UCA-202 USB card, which runs to my stereo.

So I don't care anything about any built-in audio, nor any HDMI audio, etc.

I may use the UCA-202 one day to record some old cassettes to the computer, as I have in the past, but for now, the only microphone I want to use is my webcam microphone.


Thanks!

Offline

#5 2020-05-14 06:36:34

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 25,380

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

There is a way to streamline some of this go into the configuration section of pavucontrol and set the profiles of the cards you don't need to "Off".

For the recording with the webcam, does opening audacity with 

PULSE_LATENCY_MSEC=60 audacity #or $browser or zoom

help?

Offline

#6 2020-05-14 07:42:30

chrisco23
Member
Registered: 2017-12-13
Posts: 156

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

Sadly, no change.  FWIW I did make the pavucontrol configuration changes ("Off").

Then just now, I found the old cheap webcam I bought forever ago, and the audio recording on it works fine.  lsusb  identifies it as:  Bus 010 Device 003: ID 093a:2620 Pixart Imaging, Inc.

Again though, I can't see how there could be a problem with the mic on the newer webcam as it works fine in Windows 7.

Offline

#7 2020-05-14 07:49:33

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 25,380

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

Output of 

amixer -c4

? Some other things you can try is switching the profile of the webcam to digital/SPDIF/IEC in the configuration (though I'd suspect the mic to not work at all if I'm interpreting the advertised functionality correctly) and try muting one of the stereo channels (it could be that this is being mixed/advertised incorrectly)

You could also probe for a kernel regression by testing linux LTS or so, but I'd feel that to be a bit far fetched right now.

Last edited by V1del (2020-05-14 07:50:17)

Offline

#8 2020-05-14 08:00:47

chrisco23
Member
Registered: 2017-12-13
Posts: 156

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

Here is the amixer output:

$ amixer -c4
Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 45
  Mono:
  Front Left: Playback 25 [56%] [-20.00dB] [on]
  Front Right: Playback 25 [56%] [-20.00dB] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume cvolume pswitch pswitch-joined cswitch cswitch-joined
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: Playback 0 - 20 Capture 0 - 30
  Front Left: Playback 16 [80%] [24.00dB] [off] Capture 30 [100%] [30.00dB] [off]
  Front Right: Playback 16 [80%] [24.00dB] [off] Capture 30 [100%] [30.00dB] [off]
Simple mixer control 'Auto Gain Control',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]

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#9 2020-05-14 21:22:11

chrisco23
Member
Registered: 2017-12-13
Posts: 156

Re: [SOLVED] Logitech C920 webcam, audio noise on Zoom/Meet,

I finally did get things working so I'll be marking this solved.

Unfortunately I'm not completely sure what exactly finally worked.

In the pulse trouble-shooting wiki, I went through and it actually told me to set default-sample-rate to the value I got and it was 32000, which doesn't make any sense to me and I hope I can change it back.

I did various reinstalls of pulse, alsa, etc.

I have a ridiculous amount of USB peripherals and I was running a powered KVM switch plus 3 unpowered 4-port USB hubs.

I can't be sure then but the very last thing I did was just to remove one of the USB hubs (I had been trying to drive 3 external hard drives off an unpowered 4-port hub, was working, but flaky), and make a few other adjustments to what USB device is plugged in where.  I will likely be purchasing some powered USB hub to replace the 2 (or 3) unpowered hubs, but for now things are working, and I just got through an important 45-minute Google Meet.

I hope I haven't wasted too much of peoples' times for what possibly was related to USB ports somehow.

Thanks.

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