[Bug 81200] New: [BYT Regression]igt/pm_rpm/debugfs-forcewake-user causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81200

          Priority: high
            Bug ID: 81200
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]igt/pm_rpm/debugfs-forcewake-user
                    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: Yes. 
Good commit on -next-queued: 57127efaf1adc5e0bb2d3fa5a01bd97f71af7836

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: 16025dad8e9964a5810385f755d43f1c48d6fdcc(fails)
    drm-intel-nightly: 2014y-07m-09d-14h-17m-14s integration manifest
origin/drm-intel-next-queued: d101c8fe9bda6578ae72d6021415cfaad2b422f0(fails)
    drm/i915: remove i915_rstdby_delays debugfs entry
origin/drm-intel-fixes: 01527b3127997ef6370d5ad4fa25d96847fbf12a(works)
    drm/i915/vlv: T12 eDP panel timing enforcement during reboot

==Bug detailed description==
igt/pm_rpm/debugfs-forcewake-user causes system hang. 

We can not get dmesg because system hang.


Output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rpm
--run-subtest debugfs-forcewake-user
IGT-Version: 1.7-g6b986a2 (x86_64) (Linux:
3.16.0-rc4_drm-intel-nightly_140ef1_20140711+ x86_64)
Runtime PM support: 1
PC8 residency support: 0



==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest debugfs-forcewake-user

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