Public bug reported:

CID: 201206-11418 Dell Inspiron N5425

After the proprietary driver, fglrx-experimental-12, was installed via jockey, 
the brightness control does not work at all on this system.
(It works with radeon driver.)

Unable to control brightness with brightness key, neither with
"Birhgtness and Lock" in System Settings.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.5.0-34-generic 3.5.0-34.55~precise1
ProcVersionSignature: Ubuntu 3.5.0-34.55~precise1-generic 3.5.7.13
Uname: Linux 3.5.0-34-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
ApportVersion: 2.0.1-0ubuntu17.3
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 1: Generic [HD-Audio Generic], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  ubuntu     1738 F.... pulseaudio
 /dev/snd/controlC0:  ubuntu     1738 F.... pulseaudio
CRDA:
 country TW:
        (2402 - 2472 @ 40), (3, 27)
        (5270 - 5330 @ 40), (3, 17), DFS
        (5735 - 5815 @ 40), (3, 30)
Card0.Amixer.info:
 Card hw:0 'HDMI'/'HDA ATI HDMI at 0xfeb44000 irq 52'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,00aa0100,00100300'
   Controls      : 6
   Simple ctrls  : 1
Card0.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xfeb40000 irq 16'
   Mixer name   : 'Conexant CX20590'
   Components   : 'HDA:14f1506e,10280561,00100003'
   Controls      : 20
   Simple ctrls  : 10
Date: Fri Jun 14 16:00:35 2013
HibernationDevice: RESUME=UUID=770418a5-35a9-4a8e-b5e7-1773a925f90e
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 
(20130213)
MachineType: Dell Inc. Inspiron 5425
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:
 0 radeondrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-34-generic 
root=UUID=9514e072-517d-4e5f-8d45-fd769b1a95c6 ro quiet splash radeon.audio=1 
vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-34-generic N/A
 linux-backports-modules-3.5.0-34-generic  N/A
 linux-firmware                            1.79.4
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/30/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X31
dmi.board.name: Inspiron 5425
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: 
dmi:bvnDellInc.:bvrX31:bd01/30/2013:svnDellInc.:pnInspiron5425:pvrNotSpecified:rvnDellInc.:rnInspiron5425:rvrA02:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Inspiron 5425
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Anthony Wong (anthonywong)
         Status: New


** Tags: 201206-11418 amd64 apport-bug blocks-hwcert precise 
qa-kernel-lts-testing running-unity staging taipei-lab

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https://bugs.launchpad.net/bugs/1190903

Title:
  Unable to control brightness with fglrx driver

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