I have a similar bug on Maverick on a 5,1 Macbook Pro

Up until a couple of days ago the camera would work most of the time,
but now it's completely unrecognized by the system (the i.e. /dev/video0
device is never created) although it works perfectly on OSX.

Firmware loading doesn't seem to be the issue because according to my
research the camera's USB ID of 05ac:8507 would only appear after the
firmware was loaded.

Doing

sudo modprobe uvcvideo trace=15

spits out lots of debugging info, but it all looks OK except for this
bit:

uvcvideo: Scanning UVC chain: OT 2
uvcvideo: Found reference to unknown entity 170.
uvcvideo: No valid video chain found.

I looked around the driver source code for the error but couldn't find
out why it's erroring out.

So, pretty annoying that the camera's not working, because it worked
flawlessly on karmic. Just let me know how I could help out getting to
the bottom of this.

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https://bugs.launchpad.net/bugs/544469

Title:
  iSight webcam on Macbook Pro does not work

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