Screen Backlight Goes Blank and Won't Turn Back On

[Marty Sonke]

I was working on my computer when all of the sudden the screen went blank like it normally would after the lock screen comes on from inactivity and eventually goes blank. However, it didn't go blank from inactivity but instead just went blank randomally. It would not resume the back light upon movement of the mouse or keyboard. You could barely see the desktop and my bluetooth headphones were still playing the music I had in the background. I had to do a hard reset because I couldn't the screen well enough to run any sort of diagnostics. After reboot the screen back light started to display again without any problem. At first I thought it might be a hardware issue but now I believe it to be a software issue.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.6
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: Wed Dec 10 10:44:25 2014
DistUpgraded: 2014-06-24 12:17:59,579 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:360b]
   Subsystem: Hewlett-Packard Company Device [103c:360b]
InstallationDate: Installed on 2013-06-14 (544 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Hewlett-Packard HP G60 Notebook PC
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic root=UUID=83e05b4b-4b7e-4b53-a759-52908db03602 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to trusty on 2014-06-24 (168 days ago)
dmi.bios.date: 12/15/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.65
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3612
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 09.67
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.65:bd12/15/2010:svnHewlett-Packard:pnHPG60NotebookPC:pvrPCID:rvnHewlett-Packard:rn3612:rvr09.67:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP G60 Notebook PC
dmi.product.version: PCID
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Wed Dec 10 10:24:32 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 450
 vendor LGD
xserver.version: 2:1.15.1-0ubuntu2.4

[penalvch (penalvch)]

Marty Sonke, 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)?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]