I have the same problem.  When I am using the built in camera on my Acer
Aspire 5720Z.  At seemingly random time all of a sudden the video
display will become corrupt and messages like this will appear in
/var/log/syslog:

Jul 24 22:39:03 tardis kernel: [ 4022.172447] uvcvideo: Failed to resubmit 
video URB (-45).
Jul 24 22:39:03 tardis kernel: [ 4022.172484] uvcvideo: Failed to resubmit 
video URB (-45).
Jul 24 22:39:03 tardis kernel: [ 4022.172517] uvcvideo: Failed to resubmit 
video URB (-45).

Camera model: Acer CrystalEye webcam
Kernel: Linux tardis 2.6.24-20-generic #1 SMP Thu Jul 17 16:29:46 UTC 2008 i686 
GNU/Linux

I've attached the output from 'lsusb -v' the webcam is the first device
in the list.  I don't know it it's helpful or not, but I figured it
couldn't hurt.

If there's anything I can do to help test this let me know.

Thanks,
Brian

** Attachment added: "Output from 'lsusb -v'"
   http://launchpadlibrarian.net/16295146/camera.txt

-- 
uvcvideo: USB cam hangs after a few seconds (Patch available upstream)
https://bugs.launchpad.net/bugs/243731
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