I have to confess I haven't read all the 127 comments in detail, but there might be quite a lot of separate issues involved. I would suggest to open one bug for the "ati" driver, and one for the "fglrx" driver. And get only updated reports from Edgy, with Xorg.0.log and xorg.conf attached.
To get more debug info, maybe someone can try logging in over ssh and watch systems log (try "sudo cat /proc/kmsg") while the local screen freezes. Or even try to debug Xorg, see https://wiki.ubuntu.com/DebuggingProgramCrash For a workaround to the failing Safe Graphics Mode, see https://wiki.ubuntu.com/EdgyKnownIssues -- Lockup problems with both the free xorg ATI driver and the proprietary fglrx driver, using various ATI cards https://launchpad.net/bugs/30447 -- kubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
