Created attachment 128845 [details] 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
(In reply to David Purton from comment #0) > I have done a git bisect and the results are: > > git checkout ed4a6a7ca853253f9b86f3005d76345482a71283~ works. > git checkout ed4a6a7ca853253f9b86f3005d76345482a71283 exhibits the problem. The bad commit is commit ed4a6a7ca853253f9b86f3005d76345482a71283 Author: Matt Roper <matthew.d.roper@intel.com> Date: Tue Feb 23 17:20:13 2016 -0800 drm/i915: Add two-stage ILK-style watermark programming (v11)
Looks like a dupe of bug 96645 *** This bug has been marked as a duplicate of bug 96645 ***
I can confirm that the patch posted to bug 96645 fixes my problem. Thank you.
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