I'm getting exactly the same problem. This happened right after I changed my account settings so it would log in without asking a password - I don't know whether this is related, but I haven't seen anything like this before.
** Attachment added: "Xorg log" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1070677/+attachment/3442558/+files/Xorg-log-crash.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1070677 Title: Xorg fails to start because of Radeon Issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1070677/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs