Arch Linux

ootks

Member

Registered: 2020-07-31

Posts: 2

Webcam Microphone Fails Intermittently

I am attempting to use a new webcam's built in microphone on a desktop computer on a recent install. The webcam is detected and appears when I list audio devices.

The microphone seems to work briefly after being plugged in, but always fails after any program takes in its output. For example, immediately after plugging in the webcam, the following succeeds:

arecord -f S16_LE -c 2 -r 48000 -D hw:2,0 -d 5 testS16_LE.wav -v 

After the first recording, subsequent attempts to record will produce a silent audio file. A similar thing happens when I try to adjust the settings using pavucontrol; if run immediately after the device is plugged in, pavucontrol indicates that the webcam is functioning normally, and on every subsequent attempt, it will indicate that the webcam is detecting a very high volume.

The result of dmesg after plugging in the webcam:

[   73.359995] snd_hda_intel 0000:00:1f.3: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
[  120.636393] usb 1-13.3: new high-speed USB device number 9 using xhci_hcd
[  120.743584] usb 1-13.3: New USB device found, idVendor=0c45, idProduct=6366, bcdDevice= 1.00
[  120.743589] usb 1-13.3: New USB device strings: Mfr=2, Product=1, SerialNumber=3
[  120.743593] usb 1-13.3: Product: HD Webcam USB
[  120.743596] usb 1-13.3: Manufacturer: HD Webcam USB
[  120.743598] usb 1-13.3: SerialNumber: HD Webcam USB
[  120.759239] mc: Linux media interface: v0.10
[  120.769621] videodev: Linux video capture interface: v2.00
[  120.811562] usb 1-13.3: 3:1: cannot get freq at ep 0x84
[  120.942318] usbcore: registered new interface driver snd-usb-audio
[  120.943174] uvcvideo: Found UVC 1.00 device HD Webcam USB (0c45:6366)
[  120.963348] uvcvideo 1-13.3:1.0: Entity type for entity Extension 4 was not initialized!
[  120.963353] uvcvideo 1-13.3:1.0: Entity type for entity Extension 3 was not initialized!
[  120.963357] uvcvideo 1-13.3:1.0: Entity type for entity Processing 2 was not initialized!
[  120.963360] uvcvideo 1-13.3:1.0: Entity type for entity Camera 1 was not initialized!
[  120.963655] input: HD Webcam USB: HD Webcam USB as /devices/pci0000:00/0000:00:14.0/usb1/1-13/1-13.3/1-13.3:1.0/input/input38
[  120.963911] usbcore: registered new interface driver uvcvideo
[  120.963914] USB Video Class driver (1.1.1)
[  121.009154] usb 1-13.3: 3:1: cannot get freq at ep 0x84
[  121.072774] usb 1-13.3: 3:1: cannot get freq at ep 0x84

I can also supply the results of alsa-info.sh if needed.