[Bug 77565] New: [BDW regression]igt/pm_pc8 subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77565

          Priority: medium
            Bug ID: 77565
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW regression]igt/pm_pc8 subcases cause 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

Created attachment 97500
  --> https://bugs.freedesktop.org/attachment.cgi?id=97500&action=edit
dmesg

System Environment:
--------------------------
Platform: BDW
kernel:   (drm-intel-nightly)

Bug detailed description:
----------------------------
igt/pm_pc8 subcases (like debugfs-read, gem-execbuf) cause system hang on
latest -nightly (1e771b84e47085ef9b6efea1321e7cb5a8b2c065)

It's a regression bug

output:
IGT-Version: 1.6-g43c2ed7 (x86_64) (Linux:
3.14.0_drm-intel-nightly_1e771b_20140417+ x86_64)
Runtime PM support: 1
PC8 residency support: 1



Reproduce steps:
---------------------------- 
1.  ./pm_pc8 --run-subtest debugfs-read

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