Arch Linux

pashazz

Member

Registered: 2014-11-10

Posts: 10

USB Microphone does record crackling only

Hello! After recent update (less than a week) I encountered a problem with my USB mic. I use PulseAudio and now I am unable to record ANYTHING in ANY app.

**** List of CAPTURE Hardware Devices ****
card 1: C920 [HD Pro Webcam C920], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 2: PCH [HDA Intel PCH], device 0: VT1708S Analog [VT1708S Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

pacmd output related to USB device:

index: 1
        name: <alsa_input.usb-046d_HD_Pro_Webcam_C920_63D5B7BF-02.analog-stereo>
        driver: <module-alsa-card.c>
        flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
        state: RUNNING
        suspend cause: 
        priority: 9049
        volume: front-left: 64075 /  98% / -0,59 dB,   front-right: 64075 /  98% / -0,59 dB
                balance 0,00
        base volume: 9619 /  15% / -50,00 dB
        volume steps: 65537
        muted: no
        current latency: 0,44 ms
        max rewind: 0 KiB
        sample spec: s16le 2-channel 3200
        channel map: front-left,front-right
                     Stereo
        used by: 1
        linked by: 1
        fixed latency: 99,94 ms
        card: 1 <alsa_card.usb-046d_HD_Pro_Webcam_C920_63D5B7BF-02>
        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 = "1"
                alsa.card_name = "HD Pro Webcam C920"
                alsa.long_card_name = "HD Pro Webcam C920 at usb-0000:00:14.0-3.3, high speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:14.0-usb-0:3.3:1.2"
                sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3.3/3-3.3:1.2/sound/card1"
                udev.id = "usb-046d_HD_Pro_Webcam_C920_63D5B7BF-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_63D5B7BF"
                device.form_factor = "webcam"
                device.string = "front:1"
                device.buffering.buffer_size = "12792"
                device.buffering.fragment_size = "3196"
                device.access_mode = "mmap"
                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>

No matter how loud I speak it does not record anything:

Pulseaudio version 6.0; kernel version 4.1.2-2-ARCH

In Windows this device does work  flawlessly.

pashazz

Member

Registered: 2014-11-10

Posts: 10

Re: USB Microphone does record crackling only

Fixed by insertion of external sound card (very strange issue)