please add more information, does this still happen? Try sudo dpkg- reconfigure xserver-xorg in a terminal, and use the default options. does this still occur after this?
** Changed in: Ubuntu Status: Unconfirmed => Needs Info -- My screen frozen! https://launchpad.net/bugs/72704 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs