leex, thank you for reporting this and helping make Ubuntu better.
Could you please capture the crash following
https://wiki.ubuntu.com/DebuggingSystemCrash ?
** Changed in: xorg (Ubuntu)
Importance: Undecided => Medium
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1558341
Title:
Xorg freeze
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