Probably more of a bug with X or your X drivers. Please attach
/var/log/Xorg.0.log to this bug report.
** Package changed: gdm (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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Graphics messed up, most likely by fast screen updates.
https://bugs.launchpad.net/bugs/577461
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