Seems to be a bug with the open source Radeon driver. Are you able to reproduce the same thing with the proprietary fglrx driver?
** Also affects: xserver-xorg-video-ati (Ubuntu) Importance: Undecided Status: New ** Changed in: unity Status: New => Incomplete ** Changed in: unity (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/801356 Title: Lines appear at the top of the desktop, and at the bottom of some windows To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/801356/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs