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[Pablo180 <1324113@xxxxxxxxxxxxxxxxxx>]

Sorry it took so long but I had to reinstall due to an unrelated
problem. The reinstall didn't make any difference to this problem
though. I also tested Windows 8 with dual screens, just to rule out the
monitor(s) and it worked fine in Windows 8.

I tried the daily image on a Live USB and that worked fine too, no
problem at all even when opening and running programs that always seemed
to cause this problem, i.e. System Settings, Totem Video Player et al.
Dual monitors worked flawlessly. I will try and free up some disk space
and install the live image onto a disk and test it that way too just to
be sure.

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1324113

Title:
  Screen goes black or flashes with Dual Monitors when certain apps are
  opened.

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  This has been going on for a while, but only seems to occur on dual
  monitors and when certain applications are opened. Previously the
  screen would go black and then reappear and be fine. Now the screen
  either goes black and does not come back until one of the monitors is
  removed or it flashes on and off like it is trying and re-trying to
  set the resolution but failing. This goes on until I unplug a monitor.

  Applications that cause this behaviour range from Viber Desktop to
  Wine programs through to System Settings and Totem Video Player (in
  this example in the bug) but it can be random, sometimes but not
  always do they cause this behaviour. Just to clarify, this does not
  happen with the laptop screen, only when external dual monitors are
  used.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.2
  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 May 28 13:42:02 2014
  DistUpgraded: 2014-04-27 17:46:29,919 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:054d]
  InstallationDate: Installed on 2013-02-07 (474 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Dell Inc. XPS L421X
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=5ce6b55e-d260-430c-a0cf-bd634db73afa ro resume=UUID=e7da6c40-f59f-4118-b11a-6a8dcb87b771 quiet splash intel_pstate=enable vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to trusty on 2014-04-27 (30 days ago)
  dmi.bios.date: 05/22/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 08HDPJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A14
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd05/22/2013:svnDellInc.:pnXPSL421X:pvrA14:rvnDellInc.:rn08HDPJ:rvrA00:cvnDellInc.:ct8:cvrA14:
  dmi.product.name: XPS L421X
  dmi.product.version: A14
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  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
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed May 28 13:33:25 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               30324 
   vendor                                     BNQ
  xserver.version: 2:1.15.1-0ubuntu2

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