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-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1560804 Title: kscreen reports change of primary screen without apparent reason To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1560804/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp