[Bug 99340] New: no idle pc3/pc6/pc7 starting in Linux 4.7 - Macbook Air

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99340

            Bug ID: 99340
           Summary: no idle pc3/pc6/pc7 starting in Linux 4.7 - Macbook
                    Air
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dcpurton at marshwiggle.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128845
  --> https://bugs.freedesktop.org/attachment.cgi?id=128845&action=edit
dmesg output for 4.10.0-rc3 drm-tip

Under Linux 4.6 my Macbook Air spends > 60% in pc7 state. From Linux 4.7 the
system only reaches pc2. Battery life suffers significantly because of this.

I previously reported this issue at
https://bugzilla.kernel.org/show_bug.cgi?id=177151 but after discussion was
told to go here.


I built drm-tip 9ea6a075c23ea914695d57944c0e74cff0c6bff4 and this still
exhibits the problem. I have attached dmesg with debug output for this build.


I have done a git bisect and the results are:

git checkout ed4a6a7ca853253f9b86f3005d76345482a71283~ works.
git checkout ed4a6a7ca853253f9b86f3005d76345482a71283 exhibits the problem.


I run Debian Testing and have installed OS X El Capitan 10.11.6 on the Mac
partition.

Model Name: MacBook Air (11-inch, Early 2014)
Model Identifier: MacBookAir6,1
Model Number: MD712X/B

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