Please try to get a proper backtrace by following these instructions:
https://wiki.ubuntu.com/X/Backtracing
Maybe it is a good idea to check if this problem is fixed in the current
upstream Intel driver release 2.3.1 too.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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Computer hard-locks if video overlay is used with compiz [i855GME]
https://bugs.launchpad.net/bugs/222179
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