I've got a very similar problem with a Thinkpad X40 laptop with Kubuntu Intrepid : upon login, the screen would flicker 2-3 times, blank out completely and eventually go back to the kdm greeter.
I switched to a console, and tried to startx which gave me the attached logfile (x_crash.log). I finally worked-around the problem by disabling the composite extension in xorg.conf : Section "Extensions" Option "Composite" "false" EndSection ** Attachment added: "x_crash.log" http://launchpadlibrarian.net/18577004/x_crash.log -- X start crashes i915GM LVDS graphics https://bugs.launchpad.net/bugs/283192 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs