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[Jérôme Poulin <jeromepoulin@xxxxxxxxx>]

I am currently running 4.2-rc3, I tested with acpi_osi= and backlight
control work, however, if I remove the workaround from GRUB command line
on boot, backlight keys stop working.

** Tags added: kernel-bug-exists-upstream-4.2-rc3

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https://bugs.launchpad.net/bugs/1421834

Title:
  Backlight keys not working on ASUS N550JK

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Backlight keys are not working when logged in the desktop, using
  /sys/class/backlight/intel_backlight/brightness can adjust the
  brightness.

  Usual workarounds listed in
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight are not working.

  WORKAROUND: Add to GRUB:
  acpi_osi=

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Feb 13 15:46:37 2015
  SourcePackage: linux-lts-utopic
  UpgradeStatus: Upgraded to trusty on 2014-03-25 (325 days ago)
  ---
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jerome.poulin   3195 F.... pulseaudio
   /dev/snd/controlC1:  jerome.poulin   3195 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.04
  MachineType: ASUSTeK COMPUTER INC. N550JK
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: root=/dev/vgUbuntu/root initrd=EFI/ubuntuefi/initrd splash quiet resume=/dev/mapper/vgUbuntu-swap acpi_osi=
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-22-generic N/A
   linux-backports-modules-3.19.0-22-generic  N/A
   linux-firmware                             1.143.2
  Tags:  vivid
  Uname: Linux 3.19.0-22-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-06-12 (44 days ago)
  UserGroups: adm dialout docker fuse kismet libvirtd lp messagebus mlocate plugdev pulse-access src sudo users vboxusers video wireshark
  _MarkForUpload: True
  dmi.bios.date: 09/26/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: N550JK.208
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: N550JK
  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.:bvrN550JK.208:bd09/26/2014:svnASUSTeKCOMPUTERINC.:pnN550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: N550JK
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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