Logitech HD Webcam Pro c910 && snd_uaudio does not work
Hans Petter Selasky
hselasky at c2i.net
Sun May 13 16:13:29 UTC 2012
On Sunday 13 May 2012 17:59:39 Matthias Apitz wrote:
> The audio recording with the above cam is not working in r214444 and
> snd_uaudio(4); on plug-in it says:
> May 13 17:22:36 tinyCurrent kernel: ugen4.4: <vendor 0x046d> at usbus4
> May 13 17:22:36 tinyCurrent kernel: uaudio0: <vendor 0x046d product 0x0821,
> class 239/2, rev 2.00/0.10, addr 4> on usbus4 May 13 17:22:36 tinyCurrent
> kernel: uaudio0: No playback!
> May 13 17:22:36 tinyCurrent kernel: uaudio0: Record: 32000 Hz, 2 ch, 16-bit
> S-LE PCM format May 13 17:22:36 tinyCurrent kernel: uaudio0: No midi
> May 13 17:22:36 tinyCurrent kernel: pcm1: <USB audio> on uaudio0
> but recording does not work:
> $ dd if=/dev/dsp1 of=/tmp/snd
> (after a second or so)
> dd: /dev/dsp1: Invalid argument
> 0+0 records in
> 0+0 records out
> 0 bytes transferred in 5.000931 secs (0 bytes/sec)
> in /var/log/messages it says in that situation:
> May 13 17:23:12 tinyCurrent kernel: pcm1: chn_read():
> pcm1:virtual:dsp1.vr0: record interrupt timeout, channel dead
> The same procedure for recording works fine in r226986 (where uaudio is
> linked in the kernel) and
> $ cat /tmp/snd > /dev/dsp
> plays fine the recorded audio. Any idea?
It might be a race. Try to delay starting webcamd, after snd_uaudio is loaded.
I remember someone reported a similar issue to me, and the solution was that
snd_uaudio must do some commands before the webcamd is started. Else it
doesn't work. This is a bug in the Webcam itself.
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