I reported what was marked as a duplicate of bug 931967, but I think it may apply here too, since I'm using AMD Radeon 6310 graphics. I'm using 12.04 Beta 1, and using the fglrx driver. You can see the full details from apport and a photo under bug 947200.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/933322 Title: LightDM graphic corruption with ati and nvidia To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/933322/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp