[Bug 91952] [Bisected Regression] Blank screen from boot until any input on X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91952

--- Comment #6 from Daniel Drake <dan at reactivated.net> ---
I can also reproduce on N2807. The bug usually bites on cold boot, and not on
reboot. I tested 20 cold boots and hit the bug 19 times.

Reverting that commit does convincingly avoid the problem, tested another 20
cold boots, 0 failures.

I added some printk's to trace the logic in intel_crtc_disable_planes() and 
intel_commit_primary_plane(). There is no obvious behavioural difference in the
case of reboot (working) vs cold boot (no display).

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