On Friday 03 Jun 2011 21:10:29 meino.cramer@gmx.de wrote:

> When i start alsamixer and select with the "soundcard"-selector
> the audio device of my usb cam ... alsamixer crashes with:
> 
>   cannot load mixer controls: Invalid argument
> 
> 
> ...still no sound via usb cam and it seems no chance to use alsamixer
> with it...damn...this /had/ worked and I dont know what it kills...
> 
> mylinux:/home/user>aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: SB [HDA ATI SB], device 0: VT2020 Analog [VT2020 Analog]
>   Subdevices: 2/2
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
> card 0: SB [HDA ATI SB], device 1: VT2020 Digital [VT2020 Digital]
>   Subdevices: 2/2
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1

Your camera's sound card is not shown here (stating the obvious).

Have you tried building it as a module and modprobe -v <driver> to see what 
messages you get?

> mylinux:/home/user>arecord -l
> **** List of CAPTURE Hardware Devices ****
> card 0: SB [HDA ATI SB], device 0: VT2020 Analog [VT2020 Analog]
>   Subdevices: 2/2
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
> card 1: CameraB404271 [USB Camera-B4.04.27.1], device 0: USB Audio [USB
> Audio] Subdevices: 1/1
>   Subdevice #0: subdevice #0
[snip...]



> !!Loaded ALSA modules
> !!-------------------
> 
> 
> 

I would suggest that you build alsa as modules at least for troubleshooting 
purposes.  I had to do that in the past to get things working in a box, 
following the recommendation of the devs.

HTH.
-- 
Regards,
Mick