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[Adam Niedling <925690@xxxxxxxxxxxxxxxxxx>]

"echo 8 > /sys/class/backlight/intel_backlight/brightness" does change
the backlight.

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https://bugs.launchpad.net/bugs/925690

Title:
  Screen brightness adjust hotkeys don't work with an Acer 5755G laptop

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I'm using a freshly installed Saucy x64. When I press fn+left/right arrow keys the brightness of the screen doesn't change and there is no bar appearing on the top right corner indicating the change in brightness.
  This laptop has two video cards: nVidia 540M and an integrated Intel HD Graphics 3000.
  If the nVidia card is disabled in BIOS the top right bar appears but the brightness still does not change.
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  krychek    2147 F.... pulseaudio
   /dev/snd/pcmC0D0p:   krychek    2147 F...m pulseaudio
  CurrentDmesg:

  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=5dc00776-6f67-42d1-9985-15bf84510b70
  InstallationDate: Installed on 2013-10-30 (3 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Acer Aspire 5755G
  MarkForUpload: True
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB:
   0 inteldrmfb
   1 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=d4c46cde-ec44-4da4-b4ec-a67f7b892126 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  Tags:  saucy
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 08/09/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.21
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JV51_HR
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.21
  dmi.modalias: dmi:bvnAcer:bvrV1.21:bd08/09/2012:svnAcer:pnAspire5755G:pvrV1.21:rvnAcer:rnJV51_HR:rvrBaseBoardVersion:cvnAcer:ct10:cvrV1.21:
  dmi.product.name: Aspire 5755G
  dmi.product.version: V1.21
  dmi.sys.vendor: Acer

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