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[Barney <1257766@xxxxxxxxxxxxxxxxxx>]

I have the same problem with a ZBook 14 with Intel/AMD graphics. My
current workaround is to use this script (which is actually what I use
on my desktop at night):

#!/bin/bash
xrandr -q | grep " connected" | awk '{print $1}' | while read d; do
  echo "setting $d"
  xrandr --output $d --brightness $1
done

Then just call "set-brightness 0.6" for 60% etc. This doesn't bind to
the F9 / F10 buttons, but does the trick.

HTH

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https://bugs.launchpad.net/bugs/1257766

Title:
  can not reduce brightness on HP ZBook

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  machine: HP ZBook 15
  (Intel Core i7 4700MQ Haswell, NVIDIA Quadro K1100M 2GB, 1920 x 1080 display)

  I go to the settings/Brightness & Lock section.
  The button which should controll the screen brightness is on the right-hand side.
  I move it to the left-hand side but nothing happens. The screen brightness remains to be 100% (too much for me).
  The machine is running on the AC power cable.

  The machine uses an intel graphics driver.

  It contains also the NVidia card but that one is apparently inactive
  and the system did not offer me to install it.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.12.5-0ubuntu2.1
  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: Wed Dec  4 15:32:39 2013
  DistUpgraded: Fresh install
  DistroCodename: saucy
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1909]
   NVIDIA Corporation GK107GLM [Quadro K1100M] [10de:0ff6] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1909]
  InstallationDate: Installed on 2013-12-04 (0 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Hewlett-Packard HP ZBook 15
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic root=UUID=b1bd90e2-af55-4f94-a86e-ec16ca8b47e4 ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L70 Ver. 01.06
  dmi.board.name: 1909
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL70Ver.01.06:bd10/25/2013:svnHewlett-Packard:pnHPZBook15:pvrA3009DD10303:rvnHewlett-Packard:rn1909:rvrKBCVersion94.47:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15
  dmi.product.version: A3009DD10303
  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 2.4.46-1ubuntu1
  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.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: Wed Dec  4 15:18:15 2013
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4589 
   vendor                                     AUO
  xserver.version: 2:1.14.3-3ubuntu2
  --- 
  ApportVersion: 2.12.7-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2846 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109)
  MachineType: Hewlett-Packard HP ZBook 15
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB:
   0 nouveaufb
   1 inteldrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-1-generic N/A
   linux-backports-modules-3.13.0-1-generic  N/A
   linux-firmware                            1.119
  Tags:  trusty
  Uname: Linux 3.13.0-1-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L70 Ver. 01.06
  dmi.board.name: 1909
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL70Ver.01.06:bd10/25/2013:svnHewlett-Packard:pnHPZBook15:pvrA3009DD10303:rvnHewlett-Packard:rn1909:rvrKBCVersion94.47:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard
  --- 
  ApportVersion: 2.12.7-0ubuntu6
  Architecture: amd64
  CasperVersion: 1.336ubuntu1
  CurrentDesktop: Unity
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroRelease: Ubuntu 14.04
  DistroVariant: ubuntu
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109)
  MachineType: Hewlett-Packard HP ZBook 15
  MarkForUpload: True
  Package: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1
  PackageArchitecture: amd64
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7
  Tags:  trusty ubuntu reproducible has-workaround
  Uname: Linux 3.13.0-1-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L70 Ver. 01.06
  dmi.board.name: 1909
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 94.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL70Ver.01.06:bd10/25/2013:svnHewlett-Packard:pnHPZBook15:pvrA3009DD10303:rvnHewlett-Packard:rn1909:rvrKBCVersion94.47:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ZBook 15
  dmi.product.version: A3009DD10303
  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 2.4.50-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.907-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu1
  xserver.bootTime: Thu Jan  9 17:28:35 2014
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4589 
   vendor                                     AUO
  xserver.version: 2:1.14.5-1ubuntu2

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