As of today and the latest updates, my system seems back to normal. I have tested it by putting back to normal resolution and opened 5 tabs running high res youtube videos simultaneously without issue. May that be the worst of the beta-testing for 13.04.
** Changed in: xorg (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1177638 Title: Xorg freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1177638/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs