I had the same problem with KDM using fglrx drivers with a Radeon 9600 XT. "Option "UseInternalAGPGART" "no"" appears to have solved it.
-- 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
