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[Don Jojo <joachim@xxxxxxxxxxxx>]

** Attachment added: "acpidump.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux-lts-vivid/+bug/1554089/+attachment/4591653/+files/acpidump.txt

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https://bugs.launchpad.net/bugs/1554089

Title:
  backlight can not be changed on iMac

Status in linux-lts-vivid package in Ubuntu:
  New

Bug description:
  Changes on the backlight do not have effect. Only possibility to
  change the backlight is to boot OS X, change the backlight there and
  boot back into Ubuntu.

  The bug is also discribed here: https://forum.ubuntuusers.de/topic
  /helligkeit-anpassen/ (german Website)

  I followed this guide to produce the bug-report:
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight

  On this website the problem I have is also discribed: "Backlight
  control does not work, but there are entries in /sys/class/backlight.
  This may require the ACPI backlight driver to not take control so that
  a vendor specific driver will have a chance to register (see below)."

  Kind regards
  Jojo

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-51-generic 3.19.0-51.58~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-51.58~14.04.1-generic 3.19.8-ckt13
  Uname: Linux 3.19.0-51-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Mar  7 16:09:37 2016
  InstallationDate: Installed on 2016-02-22 (14 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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