Same sort of thing happened to me. This time it happened when I left it running while I went away for a few mins and it had crashed by the time I came back.
** Attachment added: "Ubuntu Edgy with Radeon X300 - Crash when idle" http://librarian.launchpad.net/5355500/_usr_bin_Xgl.1000.crash -- crash with xgl on ubuntu edgy https://launchpad.net/bugs/66731 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
