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[Launchpad Bug Tracker <1532975@xxxxxxxxxxxxxxxxxx>]

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I am using Ubuntu 14.04.3 on a HP ProBook 430 G2/2246. It is often the
case that my screen goes black for a second and then recovers. It is my
impression that this only happens when the computer has been idle --
even for a very short time -- so I have disabled screen locking and
dimming and I have also removed the gnome-screensaver package, yet the
problem persists.

I took a look at /var/log/syslog and discovered an identical set of
error messages (dump traces, mainly) for every time this happens. I am
attaching a file with this set of messages.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.16.0-57.77~14.04.1-generic 3.16.7-ckt20
Uname: Linux 3.16.0-57-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3.19
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: Tue Jan 12 00:02:52 2016
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:2246]
InstallationDate: Installed on 2015-04-20 (266 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Hewlett-Packard HP ProBook 430 G2
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-57-generic root=UUID=3a069045-f0b3-46ac-b25f-057beaa48b7e ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/16/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M74 Ver. 01.04
dmi.board.name: 2246
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 67.22
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrM74Ver.01.04:bd08/16/2014:svnHewlett-Packard:pnHPProBook430G2:pvrA3008CD10003:rvnHewlett-Packard:rn2246:rvrKBCVersion67.22:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP ProBook 430 G2
dmi.product.version: A3008CD10003
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12+14.10.20140812-0ubuntu1.01
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Thu Dec 31 15:19:11 2015
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               14425 
 vendor                                     SEC
xserver.version: 2:1.16.0-1ubuntu1.2~trusty2

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug bios-outdated-1.16 compiz-0.9 trusty ubuntu
-- 
Screen periodically goes black for a second
https://bugs.launchpad.net/bugs/1532975
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