[Bug 81488] New: [BDW-U Regression]System hang while running "xrandr --output eDP1 --off"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81488

          Priority: high
            Bug ID: 81488
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW-U Regression]System hang while running "xrandr
                    --output eDP1 --off"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

==System Environment==
--------------------------
Regression:  Yes

Good commit on -next-queued: 91565c85b66db820f01894a971d39aaef60c4325
Bad commit on -next-queued: d101c8fe9bda6578ae72d6021415cfaad2b422f0

Non-working platforms: BDW-U 

==kernel==
--------------------------
origin/drm-intel-nightly: e61f0f00aae3bde8be33766c1b19219ef3a2c708(fails)
    drm-intel-nightly: 2014y-07m-17d-14h-33m-56s integration manifest
origin/drm-intel-next-queued: 7c908fe2cad0c11c509ad9d01e8dce3fa86af85a(fails)
    drm/i915: extract and improve gen8_irq_power_well_post_enable
origin/drm-intel-fixes: c6930992948adf0f8fc1f6ff1da51c5002a2cf95(works)
    Revert "drm/i915: reverse dp link param selection, prefer fast over wide
again"


==Bug detailed description==
System hang while running "xrandr --output eDP1 --off". unable to catch dmesg
because system hang.

Only one BDW-U device able to reproduce this bug, the other BDW-U and BDW
devices are worked.

==Reproduce steps==
---------------------------- 
1. xinit &
2. xrandr --output eDP1 --off

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