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
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X start crashes i915GM LVDS graphics
https://bugs.launchpad.net/bugs/283192
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