Comment 9 for bug 291723

This bug has been discussed in the video4linux mailing list <http://www.redhat.com/mailman/listinfo/video4linux-list> back in October.
See also the bugzilla entry related to this http://bugzilla.kernel.org/show_bug.cgi?id=11741

The reason why it worked with previous kernel is because the new gspca driver in 2.6.27 uses v4l2 while the older out-of-tree gspca patch worked with v4l1.

cf. http://bugzilla.kernel.org/show_bug.cgi?id=11741#c2
<quote>Also note that the Ubuntu devs are aware they need to patch all their apps to
use libv4l to work seamlessly with cams supported by the new gspca when moving
to 2.6.27. I'm very certain they know this as I personally told their
kerneldevs this at the Plumbers conference.</quote>

Until then, to make the webcam work you'll have to prepend the LD_PRELOAD with v4l1compat module (package libv4l-0) :

ex:
LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so effectv

or with mplayer :
mplayer tv:// -tv driver=v4l2:device=/dev/video0
(I could make the latter work with Debian but not the latest Ubuntu/Intrepid)