[Bug 65377] New: Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

          Priority: medium
            Bug ID: 65377
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Backlight control via /sys/class/backlight/radeon_bl0
                    not working
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: bastian.triller at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

This is a Macbook pro 8,2 with an Intel HD Graphics 3000 [8086:0116] and an AMD
Radeon HD 6750M [1002:6741].
The backlight interface in /sys/class/backlight/radeon_bl0 does not work.
Echoing to "brightness" does not change the brightness of the Monitor. There is
also an apple_gmux interface, which works though.
I've bound xbacklight to the brightness keys to control the brightness, but it
looks like it's confused about which interface it should use:
$ xbacklight -inc 5
No outputs have backlight property

When I disable the Radeon card on boot and use the Intel card, xbacklight
works.

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