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From: Hans Petter Selasky <hselasky@c2i.net>
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Subject: Re: snd_uaudio recording not working
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On Monday 10 May 2010 19:27:42 Richard Kolkovich wrote:
> I just updated to current RELENG_8 yesterday, and I'm having an issue with
>  my USB mic (Logitech QuickCam).  Whereas it no longer does what it used to
> (http://lists.freebsd.org/pipermail/freebsd-usb/2009-November/007800.html),
>  the recorded sounds come out as some garbled buzzing noises.  Nothing in
>  dmesg or /var/log/messages about it.
> 
> When I do 'release' the device, though, I have to reboot.  I'm testing in
>  Skype with the call test. Once I hang up the call, Skype is frozen (pegged
>  at 100% CPU, too), and my audio subsystem is in some borked state.  I can
>  still play music (through my onboard mixer device), but I can't kill Skype
>  or cat /dev/sndstat.  Here's the dmesg:
> 
> uaudio0: <vendor 0x046d product 0x0990, class 239/2, rev 2.00/0.08, addr 8>
>  on usbus7 uaudio0: No playback!
> uaudio0: Record: 16000 Hz, 1 ch, 16-bit S-LE PCM format
> uaudio0: No midi sequencer
> pcm5: <USB audio> on uaudio0

Hi,

Try to enable USB audio debugging:

sysctl hw.usb.uaudio.debug=15

I can you dump the config and device descriptor of your device with usbconfig?

> Any clues as to what is wrong?  Thanks,

Also see the other sysctls under hw.usb.uaudio

--HPS