[Bug 88976] [SNB]igt/pm_rc6_residency sub case fail.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88976

--- Comment #1 from ye.tian <yex.tian at intel.com> ---
It still exists on the latest nightly kernel(07e5c9.
ouput:
------------------
root at x-sgb4:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./pm_rc6_residency
--run-subtest rc6p-a     ccuracy
IGT-Version: 1.10-g11291fd (x86_64) (Linux:
4.0.0-rc5_drm-intel-nightly_07e5c9_20150328+ x86_64)
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:104:
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)
Stack trace:
  #0 [__igt_fail_assert+0xfc]
  #1 [residency_accuracy+0x155]
  #2 [__real_main134+0x1cf]
  #3 [main+0x21]
  #4 [__libc_start_main+0xf5]
  #5 [_start+0x29]
  #6 [<unknown>+0x29]
Subtest rc6p-accuracy failed.
**** DEBUG ****
Test assertion failure function residency_accuracy, file
pm_rc6_residency.c:104:
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)
****  END  ****
Subtest rc6p-accuracy: FAIL (0.001s)

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