[Bug 85902] New: [BSW]igt/pm_rc6_residency/rc6-accuracy sporadically fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85902

            Bug ID: 85902
           Summary: [BSW]igt/pm_rc6_residency/rc6-accuracy sporadically
                    fails
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108936
  --> https://bugs.freedesktop.org/attachment.cgi?id=108936&action=edit
dmesg

==System Environment==
--------------------------
Regression:  not sure

Non-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/f56717bdf29eb7d6a9ec15f095ea2a6858895473

==Bug detailed description==
--------------------------
It sporadically fails on BSW with -nightly kernel, fail rate:1/8.

output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
The residency counter: 1.000333
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:129:
Failed assertion: (flag_counter != 0) && (counter_result <=1)
Sysfs RC6 residency counter is inaccurate.
Subtest rc6-accuracy: FAIL (0.000s)

==Reproduce steps==
---------------------------- 
1. ./pm_rc6_residency --run-subtest rc6-accuracy

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