Maybe it's beginner's luck, but I had, seemingly, the exact same problem on a 
Dell Inspiron 1525 with the integrated webcam.
After hours of research, I decided switch to try to deactivate compiz and guess 
what? It works!
So here is step by step what I did:

1- System-->Preferences --> Appearance --> Effects --> "None" (to deactivate 
compiz)
2- Open Cheese and try any other webcam app. (I still have problems with Skype)
3- Jump and shout your joy (hopefully)
4- Reactivate Compiz (just select "Customized")
5- You can try again cheese to make sure it's still working, reboot and check 
again. 

It did it for me.
Good luck

-- 
cheese malfunctioning with UVCVIDEO webcams (was cheese doesn't show v4l2 video 
output and disables output on gstreamer-based apps ran afterwards)
https://bugs.launchpad.net/bugs/290506
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