Comment 7 for bug 544469

I have this very same problem on the final release of 10.04 Lucid, Macbook Pro 5,3. And I can also confirm that on karmic it generally worked, but sometimes randomly failed, restarting indeed seemed to fix it. But now things appear completely broken.

I did not previously have isight-firmware-tools installed, but I installed it in an attempt to fix things, and later also followed the remove-install procedure on
http://boxietuts.com/tutorials/hardware/getting-isight-to-work-on-ubuntu/ . All no effect.

I get the same message as reported in the first post:

[ 8.981596] uvcvideo: Found UVC 1.00 device Built-in iSight (05ac:8507)
[ 8.981603] uvcvideo: No valid video chain found.

I do *not* see the "unknown video" message as reported above.That would strike me as a different issue?

I attach a verbose log of modprobe uvcvideo trace=15.