[Bug 85392] New: [SNB]igt/pm_rc6_residency some subcases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85392

            Bug ID: 85392
           Summary: [SNB]igt/pm_rc6_residency some subcases fail
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108332
  --> https://bugs.freedesktop.org/attachment.cgi?id=108332&action=edit
dmesg

==System Environment==
--------------------------
Regression: No.
It's new case

Non-working platforms: SNB

==kernel==
--------------------------
origin/drm-intel-nightly: 6f628cbf2f18ac47e8afad50e3c328bbc33754d2(fails)
    drm-intel-nightly: 2014y-10m-23d-15h-48m-55s UTC integration manifest
origin/drm-intel-next-queued: 598ae05fd9378f2a6ac493b3daeb85caccce9729(fails)
    drm/i915: Emit even number of dwords when emitting LRIs
origin/drm-intel-fixes: 03a3780b0c82183110dbea7c7037a61686685511(fails)
    drm/i915: Fix GMBUSFREQ on vlv/chv

==Bug detailed description==
igt/pm_rc6_residency some subcases fail

Output:
[root at x-sgb3 tests]# ./pm_rc6_residency --run-subtest rc6p-accuracy
IGT-Version: 1.8-gac20795 (x86_64) (Linux:
3.18.0-rc1_drm-intel-fixes_03a378_20141024+ x86_64)
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:103:
Failed assertion: diff >= (SLEEP_DURATION - RC6_FUDGE)
GPU was not in RC6 long enough. Check that the GPU is as idle as possible(ie.
no X, running and running no other tests)
Subtest rc6p-accuracy: FAIL (0.000s)
[root at x-sgb3 tests]# ./pm_rc6_residency --run-subtest rc6pp-accuracy
IGT-Version: 1.8-gac20795 (x86_64) (Linux:
3.18.0-rc1_drm-intel-fixes_03a378_20141024+ x86_64)
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:103:
Failed assertion: diff >= (SLEEP_DURATION - RC6_FUDGE)
GPU was not in RC6 long enough. Check that the GPU is as idle as possible(ie.
no X, running and running no other tests)
Subtest rc6pp-accuracy: FAIL (0.000s)


==Reproduce steps==
---------------------------- 
1. ./pm_rc6_residency --run-subtest rc6p-accuracy

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