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[boukeas <1532975@xxxxxxxxxxxxxxxxxx>]

I have updated the BIOS to the latest version. Here is the output of
dmidecode:

M74 Ver. 01.16
11/26/2015

So far, I have not observed the problematic behaviour. I will mark the
bug status as Invalid, as requested, and change it to Confirmed if the
problem re-appears. Thank you.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1532975

Title:
  Screen periodically goes black for a second

Status in linux package in Ubuntu:
  Invalid

Bug description:
  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

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