kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Will Chester, thank you for reporting this and helping make Ubuntu better. As per http://us.acer.com/ac/en/US/content/drivers an update to your BIOS is available (210). If you update to this following https://help.ubuntu.com/community/BiosUpdate does it change anything?  If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Thank you for your understanding.

** Summary changed:

- Unable to adjust screen brightness
+ 1002:983d [Aspire V5-122P] Unable to adjust screen brightness

** Summary changed:

- 1002:983d [Aspire V5-122P] Unable to adjust screen brightness
+ 1002:983d [Acer Aspire V5-122P] Unable to adjust screen brightness

** Summary changed:

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

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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

** Tags added: bios-outdated-210

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

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

Status in “linux” package in Ubuntu:
  Incomplete

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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