This happens to me in Arch Linux as well, so I think it's an X11 bug.
Can anyone else confirm this? Maybe try a ctrl + alt + backspace?
** Package changed: ubuntu => xorg (Ubuntu)
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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i945 (dell d430) karmic random hard freeze/lockup
https://bugs.launchpad.net/bugs/381493
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