Hello together, this seems to affect me, too. On Ubuntu 16.4 LTS.
Lots off Syslog lines with: Feb 2 12:44:01 ws-kollstedt org.kde.KScreen[1925]: kscreen: Primary output changed from KScreen::Output(Id: 638 , Name: "DVI-I-1" ) ( "DVI-I-1" ) to KScreen::Output(Id: 638 , Name: "DVI-I-1" ) ( "DVI-I-1" ) Feb 2 12:44:01 ws-kollstedt org.kde.KScreen[1925]: kscreen: Primary output changed from KScreen::Output(Id: 638 , Name: "DVI-I-1" ) ( "DVI-I-1" ) to KScreen::Output(Id: 638 , Name: "DVI-I-1" ) ( "DVI-I-1" ) Changes from and to seems to be the same. Possible side effect, but Im not sure it correlates: Sometimes the Screen freezes, and after appox 30 seconds the System reboots. Usually it still works. The toggeling Screen was something i experienced on 2016-11-07, I resolved this by switching to the nvidia-367 package. root@ws-kollstedt:/home/kollstedt# lshw [...] product: GF119 [GeForce GT 610] vendor: NVIDIA Corporation [...] root@ws-kollstedt:/home/kollstedt# aptitude search nvidia | egrep '^i' i nvidia-367 - Transitional package for nvidia-375 i A nvidia-375 - Transitional package for nvidia-384 i A nvidia-384 - NVIDIA binary driver - version 384.111 i nvidia-modprobe - utility to load NVIDIA kernel modules and i A nvidia-opencl-icd-384 - NVIDIA OpenCL ICD i A nvidia-prime - Tools to enable NVIDIA's Prime i nvidia-settings - Tool for configuring the NVIDIA graphics d root@ws-kollstedt:/home/kollstedt# uname -a Linux ws-kollstedt 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Not sure obout the reasons, this looks for me only like the symptoms. ;-) Kind regards, Lars -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1560804/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp