[Bug 58396] [i945GM regression] in 3.7.0 kernel on macbook1,1 (kernel crash)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58396

--- Comment #7 from Daniel Vetter <daniel at ffwll.ch> ---
Created attachment 71656
  --> https://bugs.freedesktop.org/attachment.cgi?id=71656&action=edit
dump encoder responsible for modeset

Also please apply this little debug patch on top of a broken kernel and readd a
new dmesg with drm debug enabled.

Analysis thus far is that we do a completely bogus modeset on the 2nd crtc, but
while actually disabling the 1st crtc. Hence caller supplies no mode, and we
fall over with a NULL deref trying to prepare the modeset on the 2nd crtc.
Above patch might shed clue on why we try to do that bogus modeset.

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