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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1322004

Title:
  Unable to adjust screen brightness

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I am using an Acer V5-122P which uses the AMD Radeon 8250 graphics
  card. I am unable to adjust the backlight brightness, except that on
  battery if I try to toggle the brightness using the hotkeys up and
  down repeatedly, I am able to adjust the backlight brightness to the
  lowest setting. I am using Ubuntu 14.04 and fglrx, but the problem
  persists when using the open source xorg-radeon/ati driver. I have
  been experiencing this problem with all kernels and versions of Ubuntu
  since 12.04 with no changes as I've upgraded.

  I have entries in /sys/class/backlight/acpi_video0/ for brightness,
  max_brightness, actual_brightness, bl_power, type, device, subsystem,
  power, and uevent.. Directly echoing values into brightness does not
  make any changes to the screen brightness.

  Happy to answer any other questions or try any workarounds.

  Thanks,

  Will

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  will       2915 F.... pulseaudio
   /dev/snd/controlC0:  will       2915 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed May 21 23:49:10 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=1cc8d8ae-deb7-4f44-a51b-1942c71e46fe
  InstallationDate: Installed on 2013-07-20 (305 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire V5-122P
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=b71ee9d9-bc02-4546-b41b-40305aed185c ro radeon.dpm=1 radeon.modeset=0 quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-05-02 (19 days ago)
  dmi.bios.date: 04/16/2013
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V2.02.
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire V5-122P
  dmi.board.vendor: Acer
  dmi.board.version: V2.02.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.02.
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.02.:bd04/16/2013:svnAcer:pnAspireV5-122P:pvrV2.02.:rvnAcer:rnAspireV5-122P:rvrV2.02.:cvnAcer:ct10:cvrV2.02.:
  dmi.product.name: Aspire V5-122P
  dmi.product.version: V2.02.
  dmi.sys.vendor: Acer

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