[Bug 100148] New: Backlight sysfs provided erroneously

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100148

            Bug ID: 100148
           Summary: Backlight sysfs provided erroneously
           Product: DRI
           Version: unspecified
          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: acc at sphalerite.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hardware: MacbookPro8,2 (Late 2011)
Kernel: 4.9.13 from NixOS
Xorg: 1.19.2

i915 provides /sys/class/backlight/intel_backlight. This interface behaves
correctly except that it does not affect screen brightness at all, as this is
handled by gmux. The existence of the intel_backlight sysfs entry causes Xorg
to use that rather than gmux_backlight and stops xbacklight from working
correctly.

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