kernel-packages team mailing list archive

[Lewis Toohey <lewis@xxxxxxxxxxxx>]

Confirmed - upgrading to the latest bios (2.12) fixes both the
brightness issue and fixes the suspend and resume problem present in
later kernels.

Looks like this can be put to bed.

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1315834

Title:
  1002:983d [Acer Aspire V5-122P] Unable to adjust screen brightness
  using Radeon driver

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  While using the Radeon driver, I am unable to adjust the screen
  brightness on my Acer Aspire V5-122P. Adjusting brightness in the
  settings applet has no affect. Adjusting brightness with the keyboard
  function keys turns the screen on and off seemingly randomly.

  WORKAROUND: sudo -s
  cd /sys/class/backlight/radeon_bl0
  cat max_brightness
  echo 200 > brightness #Example
  echo 10 > brightness #Example
  echo 255 > brightness #Example

  Upstream post URL: http://www.spinics.net/lists/linux-
  acpi/msg50719.html

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lewis      2240 F.... pulseaudio
   /dev/snd/controlC0:  lewis      2240 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May  4 10:55:50 2014
  HibernationDevice: RESUME=UUID=42931b07-a2e1-49a1-9780-874e1d4300b7
  InstallationDate: Installed on 2014-04-14 (19 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  MachineType: Acer Aspire V5-122P
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=8a594eb2-ccc3-4aa4-a4c5-e872f4033b04 ro 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
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/18/2013
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V2.08
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire V5-122P
  dmi.board.vendor: Acer
  dmi.board.version: V2.08
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.08
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.08:bd07/18/2013:svnAcer:pnAspireV5-122P:pvrV2.08:rvnAcer:rnAspireV5-122P:rvrV2.08:cvnAcer:ct10:cvrV2.08:
  dmi.product.name: Aspire V5-122P
  dmi.product.version: V2.08
  dmi.sys.vendor: Acer

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