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[Steffan Sluis <1241745@xxxxxxxxxxxxxxxxxx>]

I downloaded and manually installed the NVIDIA drivers version 340.32
from the NVIDIA website. The brightness is still not working. I'm
running Ubuntu GNOME 14.10 on an HP Elitebook 8650w, NVIDIA Quadro 1000M
and I've tried all workaround suggested above.

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https://bugs.launchpad.net/bugs/1241745

Title:
  10de:0dfa [HP EliteBook 8560w] Changing the screen brightness does not
  work anymore in 319.xx

Status in Nvidia Feature Request and Bug Reporting:
  New
Status in nvidia-graphics-drivers-319 package in Ubuntu:
  Triaged

Bug description:
  Changing the screen brightness always used to work on my HP Elitebook
  8560w -- both with the function keys and in the dialog "Brightness &
  Lock" in the system settings. The environment light sensor also used
  to work IIRC.

  Since the update to 13.10, this stopped working. Methods I have tried that didn't work for adapting the brightness are:
  * Adding GRUB_CMDLINE_LINUX="acpi_backlight=vendor" to /etc/default/grub
  * Adding GRUB_CMDLINE_LINUX=”acpi_osi="!Windows 2012" to /etc/default/grub

  Currently I am changing the brightness manually using  xrandr --output
  LVDS-0 --brightness 0.9. However, AFAIK this does not really change
  the brightness, but only changes the contrast.

  WORKAROUND: Use nvidia-graphics-drivers-304.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: xorg 1:7.7+1ubuntu6
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-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  319.60  Wed Sep 25 14:28:26 PDT 2013
   GCC version:  gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu8)
  .tmp.unity.support.test.0:

  ApportVersion: 2.12.5-0ubuntu2
  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: Fri Oct 18 19:50:36 2013
  DistUpgraded: 2013-10-17 17:20:47,580 DEBUG enabling apt cron job
  DistroCodename: saucy
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia-319-updates, 319.60, 3.11.0-12-generic, x86_64: installed
   nvidia-319-updates, 319.60, 3.8.0-31-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation GF108GLM [Quadro 1000M] [10de:0dfa] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1631]
  InstallationDate: Installed on 2013-01-06 (285 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  JockeyStatus:
   kmod:nvidia_319_updates - nvidia_319_updates (Proprietary, Enabled, Not in use)
   kmod:nvidia_304 - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
   kmod:nvidia_304_updates - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
   kmod:nvidia_319 - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
  MachineType: Hewlett-Packard HP EliteBook 8560w
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=53f83a14-cacc-48fd-bb4b-354d69eb7f0e ro quiet splash "acpi_osi=!Windows 2012"
  SourcePackage: xorg
  UpgradeStatus: Upgraded to saucy on 2013-10-17 (1 days ago)
  dmi.bios.date: 06/11/2012
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68SVD Ver. F.27
  dmi.board.name: 1631
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 01.3B
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68SVDVer.F.27:bd06/11/2012:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3B:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8560w
  dmi.product.version: A0001D02
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.46-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
  xserver.bootTime: Fri Oct 18 19:39:07 2013
  xserver.configfile: default
  xserver.errors:
   Failed to load /usr/lib/xorg/modules/libglamoregl.so: /usr/lib/xorg/modules/libglamoregl.so: undefined symbol: _glapi_tls_Context
   Failed to load module "glamoregl" (loader failed, 7)
   open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.14.3-3ubuntu2

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