** Tags added: trusty

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https://bugs.launchpad.net/bugs/1608526

Title:
  Asus N551JM screen brightness keys fn+F5/F6 don't work unless using
  kernel parameter acpi_osi=

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Keyboard combination fn+F5/F6 keys doesn't decrease/increase the
  screen brightness.

  WORKAROUND: Add kernel parameter:
  acpi_osi=

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-31-generic 4.4.0-31.50
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vincas     4675 F.... pulseaudio
   /dev/snd/controlC0:  vincas     4675 F.... pulseaudio
  Date: Mon Aug  1 16:20:41 2016
  HibernationDevice: RESUME=UUID=8c5322e6-f871-4abf-b1e0-61b84f0aa4b4
  InstallationDate: Installed on 2015-06-25 (402 days ago)
  InstallationMedia: Kubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 
(20150219.1)
  MachineType: ASUSTeK COMPUTER INC. N551JM
  ProcEnviron:
   LANGUAGE=
   TERM=screen-256color
   PATH=(custom, no user)
   LANG=lt_LT.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed 
root=UUID=e2407f5a-3411-4b70-a245-7c128267680f ro quiet splash acpi_osi= 
vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-31-generic N/A
   linux-backports-modules-4.4.0-31-generic  N/A
   linux-firmware                            1.157.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-07-30 (1 days ago)
  dmi.bios.date: 10/06/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: N551JM.204
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: N551JM
  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.:bvrN551JM.204:bd10/06/2014:svnASUSTeKCOMPUTERINC.:pnN551JM:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN551JM:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: N551JM
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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