Jonathon, I've put kernel with webcam debug enabled at:

http://people.canonical.com/~cking/443278/linux-
image-2.6.31-13-generic_2.6.31-13.45_amd64.deb

It's probably worth downloading and installing this, and then loading
the module with all the debug options enabled:

Boot with the webcam not plugged in, then:

sudo modprobe -r pwc

re-load the module with debug turned on:
 
sudo modprobe pwc  trace=255

and then plug on the webcam and start cheese.  Then send the dmesg
output, e.g.

dmesg > dmesg.txt

and attach dmesg.txt to the log. It may show some reasons why this
driver fails in this mode.

Colin

-- 
Logitech QuickCam Pro 3000 USB webcam does not work if connected after booting
https://bugs.launchpad.net/bugs/443278
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