Logitech C920 - no sound...

English Hardware
1

After living without a microphone input on my computer for a few years, I was shopping for a compatible usb micrphone and realized the WebCam I have has a microphone attached.

After several hours down this rat hole, I need some help. It looks to me like the sound module is not loading for this device.


$ sudo cat /etc/os-release
NAME="openSUSE Leap"
VERSION="42.3"
ID=opensuse
ID_LIKE="suse"
VERSION_ID="42.3"
PRETTY_NAME="openSUSE Leap 42.3"

$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 2: ALC892 Alt Analog [ALC892 Alt Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

$ lsusb |grep Logit
Bus 005 Device 013: ID 046d:082d **Logit**ech, Inc. HD Pro Webcam C920

hwinfo --usb gives:


16: USB 00.0: 0000 Unclassified device
  [Created at usb.122]
  Unique ID: 0Ce3.pvHYR+pXt90
  Parent ID: nzpY.517_uEWzBl2
  SysFS ID: /devices/pci0000:00/0000:00:1c.6/0000:04:00.0/usb5/5-1/5-1.4/5-1.4.4/5-1.4.4:1.0
  SysFS BusID: 5-1.4.4:1.0
  Hardware Class: unknown
  Model: "Logitech HD Pro Webcam C920"
  Hotplug: USB
  Vendor: usb 0x046d "Logitech, Inc."
  Device: usb 0x082d "HD Pro Webcam C920"
  Revision: "0.11"
  Serial ID: "589981AF"
  Driver: "uvcvideo"
  Driver Modules: "uvcvideo"
  Device File: /dev/input/event16
  Device Files: /dev/input/event16, /dev/input/by-id/usb-046d_HD_Pro_Webcam_C920_589981AF-event-if00, /dev/input/by-path/pci-0000:04:00.0-usb-0:1.4.4:1.0-event
  Device Number: char 13:80
  Speed: 480 Mbps
  Module Alias: "usb:v046Dp082Dd0011dcEFdsc02dp01ic0Eisc01ip00in00"
  Driver Info #0:
    Driver Status: uvcvideo is active
    Driver Activation Cmd: "modprobe uvcvideo"
  Config Status: cfg=no, avail=yes, need=no, active=unknown
  Attached to: #23 (Hub)

pavucontrol tool only shows input from the sound card.

Any help/suggestions would be appreciated…

2

The snd-usb-audio module supports some Logitech devices…

modinfo snd-usb-audio|grep 046D

and it is possible to load the driver with VID and PID options like this

modprobe snd-usb-audio vid=0x046D pid=0x082D

*As to whether it can really support this particular Logitech model only experimentation will tell. (It might be supported with a more recent kernel perhaps.)

3

Thanx so much!!! Now recognized by pavucontrol so we’re on our way…:slight_smile:

4

That reads like progress but to make it persistent it will need to be loaded at boot. That could be done via /etc/modprobe.d/50-sound.conf using something like ‘options snd-usb-audio index=0 vid=0x046D pid=0x082D’

I’m not sure if the existing sound card needs to be explicitly configured, but something like the following might ensure the correct sound card ordering…

options snd_hda_intel index=0 model=auto
options snd-usb-audio index=1 vid=0x046D pid=0x082D
5

For grins, added above and got the error on reboot:


    7.686087] **snd**-usb-audio 5-1.4.4:1.2: cannot find the slot for index 1 (range 0-1), error: -16
    7.686093] **snd**-usb-audio: probe of 5-1.4.4:1.2 failed with error -16
    7.686112] usbcore: registered new interface driver **snd**-usb-audio

unregistering the snd-usb-audio didn’t allow me to add it back successfully.

The module does seem to remain across a reboot after doing the original command. Interestingly. when it does reboot (and the Webcam audio stays online), it’s not seen in Yast (hw->sound) but:


$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 2: ALC892 Alt Analog [ALC892 Alt Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Dummy [Dummy], device 0: Dummy PCM [Dummy PCM]
  Subdevices: 7/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 2: C920 [HD Pro Webcam C920], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

…so “something” seems to be adding a “dummy” device…

Anyway, sound works with a recording program and (I think) is working with Hangouts…

Thanx again @deano_ferrari for your help