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[Erik Quaeghebeur <launchpad@xxxxxxxxxxxxxxxxxxxxxxx>]

I can confirm this and might have some extra info.
Hardware: intel 945GM, 1440x900 laptop LVDS, 1600x1200 external VGA.
Software: Kubuntu 10.04 amd64 currently up-to-date.

Without Kwin compositing, everything works (but I prefer compositing
over the laptop display as a second screen).

With Kwin compositing:
X crashes when trying to put both screens next to each other in krandr.
When using absolute placement, X crashes when there is no overlap between the screens (trying to fake "next to each other").
When using absolute placement with total resolution 'small' enough, it worked (small here = virtual framebuffer up to 1600x2000), for 'large' ones, Kwin Compositing gets turned off and it still works (although I thought that on one trial X crashed at some point, not sure).
I did not test enough absolute placement offsets to see what resolution bounds were involved in the "Kwin turning compositing off"-aspect (it seemed to be strictly lower than 2048x2048, i.e., that was not the upper bound) or the X-crashes apect (only encountered this consistently with disjunct display placements).

Let me know if there is something specific I can do to help resolve this
issue.

-- 
lucid X crashes with dual head configuration when opengl is enabled with intel GM945
https://bugs.launchpad.net/bugs/559883
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