Seems there's 2 issues here:
1) sometimes occurring independently
May 26 08:41:05 ridgerunner kernel: [   14.262710] uvcvideo: Unknown video 
format 32595559-0000-0010-8000-000000359b71
May 26 08:41:05 ridgerunner kernel: [   14.262722] uvcvideo: Found UVC 1.00 
device Built-in iSight (05ac:8507)
May 26 08:41:05 ridgerunner kernel: [   14.262729] uvcvideo: No streaming 
interface found for terminal 2.
May 26 08:41:05 ridgerunner kernel: [   14.262849] usbcore: registered new 
interface driver uvcvideo

May 29 08:04:16 ridgerunner kernel: [   12.893912] uvcvideo: Found UVC 1.00 
device Built-in iSight (05ac:8507)
May 29 08:04:16 ridgerunner kernel: [   12.893919] uvcvideo: No valid video 
chain found.
May 29 08:04:16 ridgerunner kernel: [   12.893939] usbcore: registered new 
interface driver uvcvideo

2) sometimes they coincide
May 24 08:48:33 ridgerunner kernel: [   12.729848] uvcvideo: Unknown video 
format 32595559-0000-0010-8000-000000389b71
May 24 08:48:33 ridgerunner kernel: [   12.729859] uvcvideo: Found UVC 1.00 
device Built-in iSight (05ac:8507)
May 24 08:48:33 ridgerunner kernel: [   12.729865] uvcvideo: No valid video 
chain found.
May 24 08:48:33 ridgerunner kernel: [   12.729892] usbcore: registered new 
interface driver uvcvideo

#1 the video format issue (see bug 544740 listed as a dup of this bug but I 
think is not)
#2 no valid video chain (this bug and by far the most prevalent)

Both problems seem to be fixed upstream: MacBookPro5,5 with 2.6.34
kernel (note Cheese seg faults so use something else)

-- 
iSight webcam on Macbook Pro does not work
https://bugs.launchpad.net/bugs/544469
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