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[Bug 1416186] Re: [drm:radeon_acpi_init] *ERROR* Cannot find a backlight controller

 

Jonathan Brier, thank you for reporting this and helping make Ubuntu
better. Could you please provide the full computer model as noted on the
sticker of the computer itself (not from the Bug Description)?

** Tags added: needs-full-computer-model

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

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1416186

Title:
  [drm:radeon_acpi_init] *ERROR* Cannot find a backlight controller

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  The dmesg lists an Error that the backlight cannot be found with dmesg
  -l err.

  The system test of the backlight controls pass, but periodically there
  is a loss of control of the backlight control where trying to brighten
  the screen or dim it with the keyboard controls does not function and
  remains in its current state.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
  Uname: Linux 3.16.0-29-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.7-0ubuntu8.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu Jan 29 21:05:25 2015
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Richland [Radeon HD 8650G] [1002:990b] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:198a]
   Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8670A/8670M/8750M] [1002:6600] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2015-01-29 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20141015)
  MachineType: Hewlett-Packard HP ENVY TS 15 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-29-generic.efi.signed root=UUID=1cc26cb0-3476-4abf-a12e-acac53ba8537 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/06/2014
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.18
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 198A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 03.14
  dmi.chassis.asset.tag: 5CG32129MN
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsyde:bvrF.18:bd11/06/2014:svnHewlett-Packard:pnHPENVYTS15NotebookPC:pvr0888100000305B00000320000:rvnHewlett-Packard:rn198A:rvrKBCVersion03.14:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP ENVY TS 15 Notebook PC
  dmi.product.version: 0888100000305B00000320000
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.2-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.2-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Thu Jan 29 20:59:15 2015
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.16.0-1ubuntu1.2
  xserver.video_driver: radeon

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