Can you please collect a full backtrace from when X crashes?
http://wiki.ubuntu.com/X/Backtracing has directions on doing this.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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[hardy] X crashes when using compiz 0.7.4 + firefox 3.0b5 + java applets ("VNC
java viewer")
https://bugs.launchpad.net/bugs/224798
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