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[Hans Deragon <hans@xxxxxxxxxxx>]

Following instructions found in bug #562005, I fixed the problem in
Ubuntu 14.04.03 LTS Trusty Thar.  Attached, the script which fixes the
problem.  It only creates the file /usr/share/X11/xorg.conf.d/99-nvidia-
proprietary-brigthness-keys-fix.conf if a card that suffers from the
problem is detected.  Thus for cards without issue, if this script is
executed, no change is brought to the system.  This makes it pretty
safe.

This script should be added to the package that performs the
installation of the package.  Can someone help me figure out how to do
this or want to take the lead from here?

** Attachment added: "Script that fixes the brightness keys for NVIDIA proprietary drivers."
   https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1389215/+attachment/4488588/+files/nvidia-proprietary-brigthness-keys-fix.sh

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https://bugs.launchpad.net/bugs/1389215

Title:
  Brightness controls are not working in Unity / Xorg because of Nvidia
  proprietary driver.

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Brightness controls are not working in Unity / Xorg.  When pressing
  the keys <fn><home> and <fn><end> on my Lenovo W510, I see the
  indicator on the screen showing the level of brightness changing, so
  key mapping is not the problem.  However, the brightness is not
  changing.

  On the kernel level, I have the single following device:

  # cd /sys/class/backlight
  # ls -l
  total 0
  lrwxrwxrwx 1 root root 0 Nov  3 17:16 acpi_video0 -> ../../devices/pci0000:00/0000:00:03.0/0000:01:00.0/backlight/acpi_video0

  When playing with the <fn><home> and <fn><end>, the value of
  /sys/class/backlight/brightness changes accordingly.  The screen
  brightness does not change.

  Performing:

  # echo 10 >brightness

  ...does not have any effect (regardless of the value provided, 10
  being just an example).

  WORKAROUND

  There is an odd workaround.  Simply go to the console using
  <CTRL><ALT><F1> and using the <fn><home> and <fn><end> keys,
  brightness then changes.  Return to Unity / Xorg with <CTRL><ALT><F7>
  and the selected brightness persists.

  NON WORKING WORKAROUND

  On the web, I read that adding:

  Option "RegistryDwords" "EnableBrightnessControl=1"'

  in xorg.conf might fix the problem.  I do not have an xorg and when I
  let the proprietary Nvidia driver generate one and add this option, X
  does not start anymore.

  Ubuntu 14.04.1 LTS with latest updates as of this writing.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-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  331.38  Wed Jan  8 19:32:30 PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,place,put,snap,resize,move,regex,session,vpswitch,imgpng,gnomecompat,text,ring,grid,mousepoll,animation,unitymtgrabhandles,wall,expo,ezoom,workarounds,fade,scale,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Nov  4 07:38:59 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-32-generic, x86_64: installed
   bbswitch, 0.7, 3.13.0-39-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-32-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-39-generic, x86_64: installed
   tp-smapi, 0.41, 3.13.0-32-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GT216GLM [Quadro FX 880M] [10de:0a3c] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:2145]
  InstallationDate: Installed on 2014-11-01 (3 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: LENOVO 4318CTO
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-39-generic root=UUID=994f9c2c-f967-472e-ace3-23cd620ec702 ro quiet splash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/03/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6NET84WW (1.45 )
  dmi.board.name: 4318CTO
  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:bvr6NET84WW(1.45):bd10/03/2012:svnLENOVO:pn4318CTO:pvrThinkPadW510:rvnLENOVO:rn4318CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4318CTO
  dmi.product.version: ThinkPad W510
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Tue Nov  4 01:40:35 2014
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.15.1-0ubuntu2.1

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