[Bug 86186] New: [BDW]igt/pm_rpm pc8 subcases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86186

            Bug ID: 86186
           Summary: [BDW]igt/pm_rpm pc8 subcases fail
           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 109318
  --> https://bugs.freedesktop.org/attachment.cgi?id=109318&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, it has bug 85314
Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/9a7620f405895714b4e0dc3181a8328b4406287e

==Bug detailed description==
pm_rpm pc8 subcases fail on BDW with -nightly kernel. bug 85314 has been
closed, but I can't reproduce the pass.
case list:
igt/pm_rpm/gem-execbuf-stress-pc8
igt/pm_rpm/modeset-pc8-residency-stress
igt/pm_rpm/pc8-residency

run ./pm_rpm --run-subtest gem-execbuf-stress-pc8
output:
IGT-Version: 1.8-gc049c39 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_9a7620_20141112+ x86_64)
Runtime PM support: 1
PC8 residency support: 1
Test assertion failure function gem_execbuf_stress_subtest, file pm_rpm.c:1304:
Failed assertion: pc8_plus_residency_changed(120)
Subtest gem-execbuf-stress-pc8: FAIL (121.192s)

test https://bugs.freedesktop.org/show_bug.cgi?id=85314#c5 system env, output:
IGT-Version: 1.8-geae9f72 (x86_64) (Linux:
3.18.0-rc1_drm-intel-nightly_6f628c_20141024+ x86_64)
Runtime PM support: 1
PC8 residency support: 1
Test assertion failure function gem_execbuf_stress_subtest, file pm_rpm.c:1305:
Failed assertion: pc8_plus_residency_changed(120)
Subtest gem-execbuf-stress-pc8: FAIL (120.493s)

==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest gem-execbuf-stress-pc8

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