[Bug 68807] New: Power Management Regression on SNB mobile GT2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68807

          Priority: medium
            Bug ID: 68807
          Assignee: chris at chris-wilson.co.uk
           Summary: Power Management Regression on SNB mobile GT2
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: nkalkhof at web.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Hi All,

I've encountered a regression in power consumption on my SNB mobile GT2 using
the latest ~danvet/drm-intel-nightly branch. For example during vaapi playback
the power drain jumped from approx 11 Watts to 16 Watts. I've tried to reenable
power save state for all components using powertop without effect. I also
believe I've found the bad commit:

7499671cb211b34322085172c2fbb33ba87825eb drm/i915: tune the RC6 threshold for
stability. 

It seems that it takes longer for the GPU to switch to a lower C state
resulting in a higher average power consumption.

Could someone take a look at it and confirm please?

Regards
Nic

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