At least the original bug has been reported to being fixed. There are other bugs open about other configurations.
** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Unconfirmed => Fix Released -- login screen crashes https://launchpad.net/bugs/42157 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs