Comment 76 for bug 745112

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Zak Kipling (zak-k) wrote : Re: [arrandale] desktop is messed up (goes black) when laptop is docked with two external 1920x1200 monitors (x86_64)

And, rebasing, 2.6.38-10.44 from natty-proposed + the following patches also works well for me:

UBUNTU: SAUCE: drm/i915: disable PCH ports if needed when disabling a CRTC (modified)
drm/i915: Busy-spin wait_for condittion in atomic contexts
drm/i915: Reset GMBUS controller after NAK
drm/i915/crt: Remove 0xa0 probe for VGA
drm/i915/lvds: Remove 0xa0 probe for LVDS

(I haven't checked which of those five patches are required though.)