[Bug 97666] Kernel "NULL pointer dereference" with MST monitor on HSW

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97666

--- Comment #14 from Carlos Santa <carlos.santa at intel.com> ---
Finally, I am able to consistently repro this problem on HWS/BDW by disabling
RC6 power states (i915.enable_rc6=0) at least since the drm-nightly from Oct 1
(http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2016-10-01/

The tip of the drm-nightly at least since Oct 7 doesn't repro the null pointer
exception. The display stays black but forcing a mode setting change switching
from text mode (CTRL+ ALT + F1) to gfx mode (C+A+F7) "fixes" the black screen
and the UI screen is able to come back.   

Next steps:

1. Ask Tomi or someone else to see if they no longer are able to repro the null
pointer on the latest drm-nightly.

1. Continue bisecting the tree to see when the null pointer disappear as it
seems in the latest nightly I am not able to see the nullpointer anymore.

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