[Bug 67454] New: After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67454

          Priority: medium
            Bug ID: 67454
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: After suspend/resume, screen is black for all but the
                    highest levels with i915 driver on MacBook Air 6,2
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: sean.v.kelley at intel.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: XOrg 6.7.0
         Component: DRM/Intel
           Product: DRI

With Fedora 19 install on MacBook Air 6,2 (2013 June), after suspend/resume
backlight is completely black unless you are at the highest level.  Repeatable
for default kernel cmdline and for specifying vendor for backlight.

On a clean reboot, my brightness hotkeys and setting manually (e.g. su -c "echo
10 > /sys/class/backlight/intel_backlight/brightness") works fine. The
brightness 'steps' increment smoothly from 0% to 100% brightness. However,
after a suspend / restore, there are only two effective brightness steps - 0%
or about 95%. Anything below 95% brightness and the screen turns off, and
anything above that and it's about 95% brightness. The hotkeys still
technically work and show the percentage correctly (and
/sys/class/backlight/intel_backlight/brightness appears to show the correct
value too), but the actual screen is either all on or all off.

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