Does the just released Maverick kernel (linux 2.6.35-22.32) solve this?
It contains the following fix:
* (pre-stable) drm/i915: don't enable self-refresh on Ironlake
- LP: #629711
It sounds like you have a duplicate of bug #629711.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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Unpluging external screen, in a dual screen setup, causes X to lock up
https://bugs.launchpad.net/bugs/622420
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