[Bug 81200] [BYT Bisected]igt/pm_rpm/debugfs-forcewake-user causes system hang

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from yaoming <ming.yao at intel.com> ---
(In reply to comment #4)
> commit f68d697eaf3278200a7fc3c8b1d95d72837b84d8
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Mon Aug 4 07:15:09 2014 +0100
> 
>     drm/i915: only hook up hpd pulse for DP outputs

It also causes system hang.

[root at x-byt01 ~]# cd /GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests
[root at x-byt01 tests]# ./pm_rpm --run-subtest debugfs-forcewake-user
IGT-Version: 1.7-g5c7bcb1 (x86_64) (Linux: 3.16.0-rc4_ym_f68d69_20140815+
x86_64)
Runtime PM support: 1
PC8 residency support: 0

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