Can you successfully suspend & resume the machine? Also, if you can ssh
in while it's doing that, check what dmesg says. This sounds a bit like
bug 1085751.
** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu)
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1108967
Title:
Choosing "Guest Session" makes screen flicker indefinitely
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