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[Magnus Söderling <magnus.soderling@xxxxxxxxx>]

I can confirm the issue on a HP 8570w with nvidia Quadro Q2000M and
313-updates driver, in my case brightness change pop up and slider moves
but screen stays the same.

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https://bugs.launchpad.net/bugs/1132785

Title:
  Brightness controls only work after coming out of suspend

Status in “nvidia-common” package in Ubuntu:
  Confirmed

Bug description:
  I've got an Asus G75VW laptop with an nVidia GTX660M video card.

  After some tweaking of the xorg.conf file to include "Option
  "registryDwords" "EnableBrightnessControl=1"", I am able to use the
  Fn+F5 and Fn+F6 brightness control keys (and the brightness slider
  inside System Settings > Brightness and Lock), but ONLY after first
  going into suspend, and coming back out again.

  The expected behavior should be brightness control working directly
  after a reboot, not rebooting and going into suspend first.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: nvidia-experimental-310 (not installed)
  ProcVersionSignature: Ubuntu 3.8.0-7.15-generic 3.8.0
  Uname: Linux 3.8.0-7-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  313.18  Wed Jan  9 17:02:09 PST 2013
   GCC version:  gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-21ubuntu3)
  .proc.driver.nvidia.warnings.fbdev:
   Your system is not currently configured to drive a VGA console
   on the primary VGA device. The NVIDIA Linux graphics driver
   requires the use of a text-mode VGA console. Use of other console
   drivers including, but not limited to, vesafb, may result in
   corruption and stability problems, and is not supported.
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.8-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Mon Feb 25 06:51:23 2013
  DistUpgraded: Fresh install
  DistroCodename: raring
  DistroVariant: ubuntu
  DkmsStatus: nvidia-313, 313.18, 3.8.0-7-generic, x86_64: installed
  GraphicsCard:
   NVIDIA Corporation Device [10de:0fd4] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:2115]
  MachineType: ASUSTeK COMPUTER INC. G75VW
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-7-generic root=UUID=e3421aae-fa91-41b0-a0fa-0b8291f791d1 ro elevator=noop quiet splash vt.handoff=7
  SourcePackage: nvidia-graphics-drivers-experimental-310
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/07/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: G75VW.223
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: G75VW
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrG75VW.223:bd01/07/2013:svnASUSTeKCOMPUTERINC.:pnG75VW:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnG75VW:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: G75VW
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.9~daily13.02.19-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.42+git20130211.20c5607b-0ubuntu0sarvatt
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.0~git20130216.dd599188-0ubuntu0sarvatt
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.0~git20130216.dd599188-0ubuntu0sarvatt
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.2-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.99+git20130211.343b01c9-0ubuntu0sarvatt2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.3-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6+git20130107.8f934fad-0ubuntu0sarvatt
  xserver.bootTime: Mon Feb 25 06:40:34 2013
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.13.2-0ubuntu2

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