[Bug 102336] New: [BYT] Offscreen tests performance drops to <1/3 due to power management

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102336

            Bug ID: 102336
           Summary: [BYT] Offscreen tests performance drops to <1/3 due to
                    power management
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BYT
     i915 features: power/runtime PM

drm-tip RC kernel integration drops offscreen 3D tests performance to 1/3rd:
kernel git://anongit.freedesktop.org/drm-tip at
10de1e17faaab452782e5a1baffd1b30a639a261 2017-07-18_10-09-14 drm-tip:
2017y-07m-18d-10h-08m-42s UTC integration manifest

Because kernel doesn't anymore raise GPU speed from minimum (to maximum) with
those tests, as it should.

These tests include offscreen versions of following:
* GfxBench 4.0 ALU2, Tessellation, T-Rex, CarChase
  (neither Manhattan, nor CPU bound driver tests were affected)
* GLBenchmark 2.7 Egypt, T-Rex and Fill tests (Fill least)

This issue is BYT specific.

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