Can you check the /var/log/Xorg.*.log files for anything interesting? Using the 'ati' driver might be worth a try too. (Use dpkg-reconfigure xserver-xorg for that.)
** Changed in: gdm (Ubuntu)
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
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GDM logout or restart gives me a blank screen
https://launchpad.net/bugs/52084
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