kernel-packages team mailing list archive

[Will Chester <william.chester@xxxxxxxxx>]

Lewis and Chris,

I can confirm that I am experiencing the same behavior as Lewis. I have
used both the open source radeon/ati drivers as well as the proprietary
fglrx drivers (I'm currently using the fglrx-updates package
(2:13.350.1-0ubuntu2) from the Ubuntu repos). I have not yet tried the
14.4 version of fglrx, but can verify that the issue is still present
with the proprietary drivers installed.

I'm not sure if this is relevant or not, but when the laptop is
unplugged it looks as if the contrast is reduced in line with a decrease
in backlight, but the brightness is not similarly reduced. For example,
everything looks washed out and there is very little contrast. If you
then play with the brightness hotkeys and are able to reduce the
backlight to it's lowest settings (reducing the brightness), the
contrast/brightness balance is back to normal (at the lowest brightness
setting). These are the only two brightness levels that I can get
working - full brightness and lowest brightness.

I was able to use a workaround detailed here:
http://ati.cchtml.com/show_bug.cgi?id=711#c54 to get appropriate
contrast/brightness balance on battery at the highest brightness level,
but I am still unable to change the backlight settings beyond lowest or
highest brightness.

Hope that helps. Thank you for looking into this.

** Bug watch added: ATi Linux Platform Bugs #711
   http://ati.cchtml.com/show_bug.cgi?id=711

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

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

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  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.

  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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