Aha! With that extra bit of information this looks to be upstream bug:
https://bugs.freedesktop.org/show_bug.cgi?id=29173 which has just got an
upstream fix http://git.kernel.org/?p=linux/kernel/git/ickle/drm-
intel.git;a=commit;h=71c831d2cce539e0ee8e3b3fadae49355867efc2 .
Moving to the kernel, assigning jfo to ensure this gets looked at before
kernel freeze.
** Package changed: xorg (Ubuntu Maverick) => linux (Ubuntu Maverick)
** Changed in: linux (Ubuntu Maverick)
Assignee: Canonical Desktop Team (canonical-desktop-team) => Jeremy Foshee
(jeremyfoshee)
** Changed in: linux (Ubuntu Maverick)
Assignee: Jeremy Foshee (jeremyfoshee) => (unassigned)
** Tags added: kernel-handoff-graphics
--
[Maverick] Removing external display on Vostro 3500 corrupts the screen
https://bugs.launchpad.net/bugs/629711
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