[Bug 89727] [SKL] system hang when changing resolution in games or killing gnome-session twice

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89727

--- Comment #5 from ye.tian <yex.tian at intel.com> ---
The first bad commit[1] is 
c9f038a1a5924352ab8e510e4a45ac57b08db391 
Author: Matt Roper <matthew.d.roper at intel.com>
Date:   Mon Mar 9 11:06:02 2015 -0700

    drm/i915: Don't assume primary & cursor are always on for wm calculation
(v4)

[1]There are 2 ways to reproduce the issue,  "kill gnome-session twice" and
"change game resolution". By "change game resolution", we could verify the
fisrt bad commit.

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