Comment # 16 on bug 967156 from Takashi Iwai

(In reply to Gerhard de Clercq from comment #15)
> I would assume that it has to be the C-Media device because it seems to be
> the only USB audio device and it is not present when I undock.

And playing *and* recording over this C-Media device don't work at all?
If so, it's unlikely a kernel "bug".  It means that this usb device is not
compliant with the standard usb audio class :)

In anyway, please give lsusb -v output.  This may show some more details of the
usb audio widgets.