(In reply to comment #9)
> I can't make sense of this based on the commit... I'm afraid this might be
> timing related rather than an actual register change, since the register dumps
> before & after are identical.
>
> Can you isolate which part of the patch causes problems?
Argh, I'm terribly sorry for this but the actual offending commit was
drm/i915: disable PCH ports if needed when disabling a CRTC
Which needed a bit of fixing to apply to .38, but has the same failure in both the backport and the upstream kernel
(In reply to comment #9)
> I can't make sense of this based on the commit... I'm afraid this might be
> timing related rather than an actual register change, since the register dumps
> before & after are identical.
>
> Can you isolate which part of the patch causes problems?
Argh, I'm terribly sorry for this but the actual offending commit was
drm/i915: disable PCH ports if needed when disabling a CRTC
Which needed a bit of fixing to apply to .38, but has the same failure in both the backport and the upstream kernel
http:// kernel. ubuntu. com/git? p=ubuntu/ ubuntu- natty.git; a=commit; h=bbeaf8811ba07 0fd186dfcabc957 044c3a1149ac