On Saturday 22 September 2007, Laurent Pinchart wrote:

> Kernel 2.6.22 includes bug fixes in the usbaudio driver that can
> trigger another firmware bug in the webcam. Fortunately this one
> seems to have a workaround, although not a pretty one.
>
> The webcam audio interface must be initialised before the video
> interface. Linux will by default initialise the video interface
> first, so you need to remove the uvcvideo.ko module from the
> /lib/modules subdirectory where it gets loaded automatically, and
> load it manually after plugging the webcam.
>
> This is not a pretty workaround as it requires manual operations
> every time you plug the camera, but it should work.

A cleaner solution is to add the following line in 
your /etc/modprobe.conf:

install uvcvideo /sbin/modprobe 
usbaudio; /sbin/modprobe --ignore-install uvcvideo
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