[Bug 71493] New: [PATCH] get intel_backlight back into backlight_interfaces

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71493

          Priority: medium
            Bug ID: 71493
          Keywords: regression
          Assignee: chris at chris-wilson.co.uk
           Summary: [PATCH] get intel_backlight back into
                    backlight_interfaces
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mike at altlinux.org
               URL: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=65174
                    1
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 89029
  --> https://bugs.freedesktop.org/attachment.cgi?id=89029&action=edit
get intel_backlight back into backlight_interfaces (uses to just work)

xf86-video-intel commit ce1e0969058f8c70b624bc85bb8d6698a35794d3 broke
backlight controls for me when using Linux 3.7+, recent xorg and e17 on ASUS
UX31A (that's HD4000 within i7-3517U).

What works: writing to /sys/class/backlight/intel_backlight/brightness

What doesn't: writing to /sys/class/backlight/acpi_video0/brightness
(actual_brightness returns 94 or 95 with no correlation).

The problem is that xorg prefers acpi_video0 since that commit.

Booting with acpi_backlight=vendor results in /sys/class/backlight/acpi_video0/
being replaced by /sys/class/backlight/asus-nb-wmi/ with actual_brightness
value being constant 100 and writes to brightness resulting in no-op.

I have to maintain local fork of the package with the attached patch merged
into it.

Another known workaround is:

---
Section "Device"
        Identifier  "Intel Graphics"
        Driver      "intel"
        Option      "Backlight" "intel_backlight"
EndSection
--- /etc/X11/xorg.conf.d/99-intel-backlight.conf

Wonder why intel_backlight was dropped from the list in the first place as it's
known to just work on various intel videochips here so far.

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