[Bug 81483] New: [BYT]igt/kms_universal_plane/universal-plane-pipe-A-functional causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81483

          Priority: medium
            Bug ID: 81483
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT]igt/kms_universal_plane/universal-plane-pipe-A-fu
                    nctional causes system hang
        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:  only failed on -nightly

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: e61f0f00aae3bde8be33766c1b19219ef3a2c708(fails)
    drm-intel-nightly: 2014y-07m-17d-14h-33m-56s integration manifest
origin/drm-intel-next-queued: 7c908fe2cad0c11c509ad9d01e8dce3fa86af85a(skips)
    drm/i915: extract and improve gen8_irq_power_well_post_enable
origin/drm-intel-fixes: c6930992948adf0f8fc1f6ff1da51c5002a2cf95(skips)
    Revert "drm/i915: reverse dp link param selection, prefer fast over wide
again"
origin/drm-fixes: bf38b025d3f58f4c1273714ff1be5bfbf99574a4
    Merge branch 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux
into drm-fixes
origin/drm-next: 62eb3e20f8f3ca9de4a17f87effe534d6a691176（unable to exit）
    drm/tilcdc: Fix build breakage

==Bug detailed description==
igt/kms_universal_plane/universal-plane-pipe-A-functional causes system hang

Because system hangs, dmesg unable to catch.

Output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./kms_universal_plane --run-subtest universal-plane-pipe-A-functional
IGT-Version: 1.7-g428060c (x86_64) (Linux:
3.16.0-rc5_drm-intel-nightly_f326cd_20140717+ x86_64)
Testing connector eDP-1 using pipe A


==Reproduce steps==
---------------------------- 
1. ./kms_universal_plane --run-subtest universal-plane-pipe-A-functional

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