I helped troubleshoot this with him on IRC. Looking at their dmesg and syslog, it looks like nouveau is failing in some way, which is causing kscreen to fail in some way. Weird that it works with xrandr.
** Description changed: using from the menu > Preferences > lxqt settings > monitor settings you will be logged out when trying to apply any changes you make to the monitors. ie moving one from left to right However using xrandr to achieve the same and it just works Install nvidia drivers and use the nvidia-settings to do the same thing - just works + + 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP104 [GeForce GTX 1070 Ti] [10de:1b82] (rev a1) + Subsystem: ZOTAC International (MCO) Ltd. GP104 [GeForce GTX 1070 Ti] [19da:2445] + Kernel driver in use: nouveau + Kernel modules: nvidiafb, nouveau ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: lxqt-config 0.13.0-0ubuntu3 ProcVersionSignature: Ubuntu 4.17.0-9.10-generic 4.17.17 Uname: Linux 4.17.0-9-generic x86_64 ApportVersion: 2.20.10-0ubuntu9 Architecture: amd64 CurrentDesktop: LXQt Date: Mon Sep 3 21:49:32 2018 InstallationDate: Installed on 2018-09-03 (0 days ago) InstallationMedia: Lubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180901) SourcePackage: lxqt-config UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1790536 Title: lxqt-config-monitor forces logout with multiple monitors when using nouveau To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxqt-config/+bug/1790536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
