[Bug 84013] New: [IVB] backlight stops working on screen off/VT-switch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84013

          Priority: medium
            Bug ID: 84013
          Assignee: chris at chris-wilson.co.uk
           Summary: [IVB] backlight stops working on screen off/VT-switch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: adee.edu at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Hi

Commits 
08921e4bda0114c66270e500090e4cfd29f74d39 
and 
fda1ffb07e17469771bba7a8d53fd44c43ee3333

causing the backlight control to cease working after the screen turns off or
after a VT switch. Restrating the xserver makes it working again.
Reverting those two fixes the problem.

Ubuntu 14.10 3.16.0-14-generic
xserver 1.16
Intel(R) HD Graphics 4000

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