[Bug 100148] New: Backlight sysfs provided erroneously
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Mar 10 13:37:51 UTC 2017
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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