looks like a solid crash.
can you get a full backtrace by following these instructions?
https://wiki.ubuntu.com/X/Backtracing
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Importance: Undecided => High
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
--
Quadrapassel results in X crashing
https://bugs.launchpad.net/bugs/549576
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which is subscribed to xorg-server in ubuntu.
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