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[Gaele Strootman <gaele@xxxxxxxxxxxx>]

This bug is affecting me since Wily. In Vivid all was working well.

Macbook Pro 11,3 with nouveau.

/sys/class/backlight/gmux_backlight$ grep . * 
actual_brightness:16777215
bl_power:0
brightness:400
grep: device: Is a directory
max_brightness:-1
grep: power: Is a directory
grep: subsystem: Is a directory
type:platform

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https://bugs.launchpad.net/bugs/1115555

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight.

Status in Linux:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Backlight control does not work, but there are entries in
  /sys/class/backlight.

  This may require the ACPI backlight driver to not take control so that
  a vendor specific driver will have a chance to register.

  I wanto mention that this goes beyond just the applet not working.  My
  data does change in Ubuntu for those entries and the acpi interface to
  the Linux Kernel is not able to use that changed data to change the
  hardware brightness setting.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-37-generic 3.2.0-37.58
  ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35
  Uname: Linux 3.2.0-37-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  carkaci    1936 F.... pulseaudio
   /dev/snd/controlC0:  carkaci    1936 F.... pulseaudio
  CRDA:
   country AW:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd0500000 irq 48'
     Mixer name	: 'Cirrus Logic CS4206'
     Components	: 'HDA:10134206,106b1800,00100301'
     Controls      : 25
     Simple ctrls  : 11
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xd0440000 irq 49'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Mon Feb  4 21:53:10 2013
  HibernationDevice: RESUME=UUID=2850be5d-9902-4a6d-8e97-3f9d34028e02
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: Apple Inc. iMac11,3
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-37-generic root=UUID=83592388-7d5b-432f-94fe-74542604df39 ro acpi_osi=Linux quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/carkaci not ours.
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-37-generic N/A
   linux-backports-modules-3.2.0-37-generic  N/A
   linux-firmware                            1.79.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/03/10
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM112.88Z.0057.B00.1005031455
  dmi.board.name: Mac-F2238BAE
  dmi.board.vendor: Apple Inc.
  dmi.board.version: iMac11,3
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F2238BAE
  dmi.modalias: dmi:bvnAppleInc.:bvrIM112.88Z.0057.B00.1005031455:bd05/03/10:svnAppleInc.:pniMac11,3:pvr1.0:rvnAppleInc.:rnMac-F2238BAE:rvriMac11,3:cvnAppleInc.:ct13:cvrMac-F2238BAE:
  dmi.product.name: iMac11,3
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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