I am also experiencing a random crash back to the GDM login screen after the screensaver is initialized while XGL running. Nothing too fancy running at the time--openoffice, thunderbird, etc. It's a Dell Inspiron 6400.
Attached is the smaller edition of the crash report... ** Attachment added: "Problem report for xserver-xgl" http://librarian.launchpad.net/6300990/_usr_bin_Xgl.hyM5RK.crash -- screensaver make crash GDM https://launchpad.net/bugs/35501 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs