For some reason you have KMS disabled, does grep -R modeset /etc/modprobe.d/ return anything? If so get rid of that line. If not, can you try booting with radeon.modeset=1 added to the kernel command line?
** Changed in: xserver-xorg-video-ati (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/729386 Title: [Natty] DRI2 fails with x1200, compositing broken -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs