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[Bug 1349002] Re: Screen brightness cannot be changed on HP EliteBook 8560w


Iliya, thanks a lot for posting the workaround. I have downgraded Nvidia
drivers to version 304.128 and now I can adjust the screen brightness

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  Screen brightness cannot be changed on HP EliteBook 8560w

Status in linux package in Ubuntu:

Bug description:
  I cannot change the screen brightness on my HP Elitebook 8560w. If I
  use the keys for changing the screen brightness (fn + f9 or fn + f10),
  the on-screen display appears and the displayed percentage changes as
  intended but the actual screen brightness does not change (i.e. it
  remains at full brightness). Similarly, if I do not use my computer
  for some time, the on-screen display appears and indicates the the
  screen brightness is reduced (lower percentage) but the actual screen
  brightness remains unchanged (at full brightness). I have this
  computer since November 2011 and I had always the latest Kubuntu
  version installed. Changing the screen brightness always worked until
  and including Kubuntu 13.10. However, it stopped working when I
  upgraded to Kubuntu 14.04.

  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
   /dev/snd/controlC1:  ubuntu     3663 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     3663 F.... pulseaudio
  CasperVersion: 1.340
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Hewlett-Packard HP EliteBook 8560w
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/15/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68SVD Ver. F.42
  dmi.board.name: 1631
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 01.3D
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68SVDVer.F.42:bd07/15/2013:svnHewlett-Packard:pnHPEliteBook8560w:pvrA0001D02:rvnHewlett-Packard:rn1631:rvrKBCVersion01.3D:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8560w
  dmi.product.version: A0001D02
  dmi.sys.vendor: Hewlett-Packard

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