Re: Logitech C270 webcam

["Paul M. Foster" <paulf@quillandmouse.com>]

On 7/27/21 12:21 PM, Thomas Amm wrote:
> On Tue, 2021-07-27 at 11:44 -0400, Paul M. Foster wrote:
> > Folks:
> >
> > I bought a Logitech C270 webcam, which is supposed to work in Linux.
> > It
> > does, EXCEPT the microphone isn't picking up sound. I've checked in
> > alsamixer, and the microphone device can be selected. But under
> > cheese
> > or other software, it still does not capture. Yes, I've googled this,
> > but it's Linux, so there are few answers and none of them work for
> > me.
> >
> > Any help?
> >
> > Paul
> Probably, as I still am having such a camera around somewhere. I
> remember having used it and -vaguely- that I had problems to keep it
> from registering as primary audio device. So there should be a way.
> Some details would be nice to know:
> -what does 'lsmod|grep audio' return
> -what is the output of 'cat /proc/asound/cards'
> -what does 'tail -f /var/log/syslog' say when you plug in the camera
> (try hotplugging it while 'tail -f[...]' is running)
> -is the camera connected to a USB-2 or a USB-3 port? I remember the
> C270 causing trouble with some USB-3 ports.
As follows:

paulf@dudley:~$ lsmod | grep audio
snd_usb_audio         262144  2
snd_usbmidi_lib        36864  1 snd_usb_audio
snd_hwdep              16384  2 snd_usb_audio,snd_hda_codec
snd_pcm               114688  6 
snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core
snd                    94208  27 
snd_hda_codec_generic,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
usbcore               294912  9 
xhci_hcd,snd_usb_audio,usbhid,snd_usbmidi_lib,usblp,usb_storage,uvcvideo,xhci_pci,uas
paulf@dudley:~$ cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xdf040000 irq 127
 1 [U0x46d0x825    ]: USB-Audio - USB Device 0x46d:0x825
                      USB Device 0x46d:0x825 at usb-0000:00:14.0-2, 
high speed

Card #1 above is the C270.

I don't want to hotplug this thing if I can avoid it-- it's way down and 
under everything. Plugged into a USB 2 slot.

Paul