Okay, that means this commit probably caused your regression.
commit bbeaf8811ba070fd186dfcabc957044c3a1149ac
Author: Keng-Yu Lin <[email protected]>
Date: Wed Jun 22 09:49:34 2011 +0800
drm/i915: disable PCH ports if needed when disabling a CRTC
For the sake of thoroughness, could you also test the build at:
http://people.canonical.com/~sforshee/lp838181/linux-2.6.38-11.48~lp838181v201109121920/
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https://bugs.launchpad.net/bugs/838181
Title:
External monitor connected trough mini DisplayPort wired to integrated
Intel AGP is properly recognized and configured but has no sync
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