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[Launchpad Bug Tracker <1115555@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug kernel-bug-exists-upstream-v3.8-rc6 needs-upstream-testing precise regression-potential
-- 
Backlight control does not work, but there are entries in /sys/class/backlight.
https://bugs.launchpad.net/bugs/1115555
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