Just happened again. I have attached the Xorg.0.log which should contain some helpful information. I did have to press Cntl Alt F1 followed by Cntl Alt F7 in order to get back to the System Log viewer. Some of the entries in the Xorg.0.log file will contain this sequence.
** Attachment added: "Xorg.0.log" http://launchpadlibrarian.net/15933478/Xorg.0.log -- Strange Monitor Blackout with Squares - ATI https://bugs.launchpad.net/bugs/247122 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
