kern/152622: [pcm] uaudio recording problem
Hans Petter Selasky
hselasky at c2i.net
Sun Apr 10 11:18:18 UTC 2011
On Sunday 10 April 2011 13:11:22 Hans Petter Selasky wrote:
> On Sunday 10 April 2011 12:48:27 Thierry Thomas wrote:
> > On sun 10 apr 11 at 12:18:20 +0200, Hans Petter Selasky
> > <hselasky at c2i.net>
> >
> > wrote:
> > > It looks like your recording device does not have a volume control. If
> > > you:
> > >
> > > dd if=/dev/dsp1.0 of=/dev/dsp0.0 bs=64
> > >
> > > Do you then hear anything?
> >
> > Nothing, but an error is displayed:
> >
> > $ dd if=/dev/dsp1.0 of=/dev/dsp0.0 bs=64
> >
> > ~ dd: /dev/dsp1.0: Invalid argument
> >
> > 0+0 records in
> > 0+0 records out
> > 0 bytes transferred in 5.000121 secs (0 bytes/sec)
> >
> > $ ll /dev/dsp1.0 /dev/dsp0.0
> > crw-rw-rw- 1 root wheel 0, 137 9 avr 17:01 /dev/dsp0.0
> > crw-rw-rw- 1 root wheel 0, 160 10 avr 12:43 /dev/dsp1.0
> >
> > Best regards,
>
> Could you show dmesg with USB debugging on for USB audio while doing this.
> Maybe the webcam needs to be running before you get audio.
>
Also dump the configuration descriptor for your device using:
usbconfig -d X.Y dump_curr_config_desc
--HPS
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