Public bug reported:

I have a Lenovo Thinkpad W510 and the hardware brightness keys activate
the brightness slider but the screen does not respond. Neither does the
brightness slider in the system settings. It does appear that if I set
the slider and then restart the system then the display corresponds to
the location of the slider just before restart.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  295.40  Thu Apr  5 21:37:00 
PDT 2012
 GCC version:  gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
.tmp.unity.support.test.0:
 
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,decor,vpswitch,snap,move,resize,gnomecompat,grid,place,dbus,imgpng,compiztoolbox,regex,unitymtgrabhandles,mousepoll,session,animation,wall,fade,scale,workarounds,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Tue May 22 17:02:42 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 295.40, 3.2.0-23-generic, x86_64: installedError! Could not 
locate dkms.conf file.
 File:  does not exist.
 
 nvidia-current, 295.40, 3.2.0-24-generic, x86_64: installed
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 NVIDIA Corporation GT216 [Quadro FX 880M] [10de:0a3c] (rev a2) (prog-if 00 
[VGA controller])
   Subsystem: Lenovo Device [17aa:2145]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, 
Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release 
updates) (Proprietary, Disabled, Not in use)
MachineType: LENOVO 43192RU
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic 
root=UUID=2fc7d468-f87f-49c5-95cd-2044ed5c49b2 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/27/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6NET74WW (1.34 )
dmi.board.name: 43192RU
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr6NET74WW(1.34):bd10/27/2010:svnLENOVO:pn43192RU:pvrThinkPadW510:rvnLENOVO:rn43192RU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 43192RU
dmi.product.version: ThinkPad W510
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.7.8-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 precise regression-update ubuntu

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https://bugs.launchpad.net/bugs/1003128

Title:
  Brightness controls not working on Thinkpad W510

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