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Message #103732
[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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