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Am 02.12.2011 13:50, schrieb Michael Below:
> Hi,
> 
> Am Freitag, den 02.12.2011, 09:22 +0100 schrieb Alexey Fisher:
> 
>> if some thing of this will help, then you should inform usb devs.
>> and after this i personally will love to know if it works and how
>> you fixed it.
> 
> Thanks for the quick reply... I tried your suggestions: kernels
> down to 2.6.32 have similar problems (I couldn't test 2.6.26
> because the gdm3 login window froze). The USB options don't help
> either.
> 
> As an "untechnical" fix I tried using the front USB ports instead
> of the backside ones, this works! Yay! I guess it is another USB
> controller...
> 
> Somehow the sound doesn't work when plugged into the front, it
> worked (for one test call, until all USB crashed) when I had it
> plugged into the back, any idea what that might be? In pavucontrol
> and alsamixer things look good...
> 
> I will report this as a Debian bug, do you think it helps "the
> greater good" if i write to the kernel USB people as well? I don't
> think my HP is exotic hardware, and both cams seem to be quite
> popular, too...
> 
> Cheers
> 
> Michael
> 


if i'm correct, the sound issue coused by delay over usb. If you use
the mic build in to webcam then:
- - after video was started it added extra delay for usb audio controls
- - skype ajust really instsivly recod volume so use this audio controls..
- - if audio driver feel like device not responsing or too late, then it
will try to reset it.
- - this will kill uvcvideo, and crash pulse as well.

to work around, you can try nevest kernel v3.2. It use updated
usb-audio driver with longer delay.


- -- 
Regards,
Alexey
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