kern/152622: [pcm] uaudio recording problem

Hans Petter Selasky hselasky at c2i.net
Sun Apr 10 11:12:23 UTC 2011


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.

--HPS


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