The problem is gone now, and I haven't done anything to fix it. Previously I 
tried to reboot, and this doesn't help.
But today the problem disappeared after I've turned my PC off and started it 
again.
But now I have new problem: if I do full shutdown and then power on, my xubuntu 
shows black screen and nothing more (Xorg, XFCE are not started). Then if I do 
Alt+F4, I see console and can log in. After login, I do "startx" command and it 
works.
This problem reproduces only with full power off. If I select "Restart" in 
logout menu - xubuntu starts OK (no black screen, XFCE starts OK).
Not sure I need to report it as a separate bug, going to save my files to 
external hard-drive and do clean re-install of classic Ubuntu (not xubuntu).
If webcam works in clean Ubuntu, I close this bug as invalid.
If webcam doesn't work in clean Ubuntu, I'll try new kernel and update this 
bug. If there is the same problem with power-off -> power-on, then I add 
another bug.

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https://bugs.launchpad.net/bugs/1069016

Title:
  WebCam doesn't work anymore after update from 12.04 to 12.10

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