Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xorg (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1560804

Title:
  kscreen reports change of primary screen without apparent reason

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Screen blanks out to black frequently for no apparent reason no matter
  how short or long the session. Also, in the items attached below was
  created using "xdiagnose". It didn't include SDDM.log which I am using
  but instead LightDM which I am *not* using.

  =============================

  From Xorg.0.log:

  Mar 22 21:53:53 HINGE11 org.kde.KScreen[2724]: message repeated 15
  times: [ kscreen: Primary output changed from KScreen::Output(Id: 591
  , Name: "HDMI-0" ) ( "HDMI-0" ) to KScreen::Output(Id: 591 , Name:
  "HDMI-0" ) ( "HDMI-0" )]

  
  ======================
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
  Uname: Linux 4.2.0-34-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.96  Sun Nov  8 22:33:28 
PST 2015
   GCC version:  gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Tue Mar 22 21:52:10 2016
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  GraphicsCard:
   NVIDIA Corporation GT216 [GeForce GT 220] [10de:0a20] (rev a2) (prog-if 00 
[VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:34d6]
  InstallationDate: Installed on 2012-09-14 (1286 days ago)
  InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120820.1)
  LightdmGreeterLog:
   QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
   QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
   Bus::open: Can not get ibus-daemon's address.
   IBusInputContext::createInputContext: no connection to ibus-daemon
  LightdmGreeterLogOld:
   QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
   QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
   Bus::open: Can not get ibus-daemon's address.
   IBusInputContext::createInputContext: no connection to ibus-daemon
  MachineType: Gigabyte Technology Co., Ltd. GA-990XA-UD3
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-34-generic 
root=UUID=bfef49a0-28c1-480e-95b6-b010e6f905a8 ro quiet splash nomodeset 
vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/13/2011
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F9
  dmi.board.name: GA-990XA-UD3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd10/13/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-990XA-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-990XA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-990XA-UD3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.65+git20151026.c745e541-0ubuntu0ricotz~wily
  version.libgl1-mesa-dri: libgl1-mesa-dri 
11.0.4~git20151026+11.0.ec14e6f8-0ubuntu0ricotz~wily
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 
11.0.4~git20151026+11.0.ec14e6f8-0ubuntu0ricotz~wily
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  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: Tue Mar 22 21:31:59 2016
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.17.2-1ubuntu9.1

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