Running EndeavourOS with everything up-to-date:
System Details
Operating System: EndeavourOS
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.17.9-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 24 × 13th Gen Intel® Core™ i7-13700KF
Memory: 32 GiB of RAM (31.1 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 4080
Manufacturer: ASUS
If I turn off the only monitor I have connected, once I turn it back on, nothing shows up on screen - it says there is no signal from the computer. I can hear the notification sound of the hardware being disconnected when I turn it off, and I can hear the notification sound of when I turn it back on, but not signal comes through.
If I have a second monitor connected, even if it is set to disabled on KDE, turning off the first monitor sends the signal back to the second one, meaning I can turn the first one back on successfully (which disables the second monitor). This is the workaround I’m currently using.
I’m running EndeavourOS on a desktop computer with an nVidia 4080 card. extra/nvidia-open-dkms is installed. KDE Plasma is running over Wayland, and I think this issue didn’t happen on X11, but my memory might be failing me (and I don’t have a way to switch to X11 anymore). This problem has been affecting me ever since I started using Linux several months ago, persisting through several updates.
Here is the journalctl logs from when the monitor was turned off, then on again:
Logs
Nov 16 22:03:50 pc-eos kwin_wayland[1189]: Atomic modeset test failed! Invalid argument
Nov 16 22:03:50 pc-eos kwin_wayland[1189]: Atomic modeset test failed! Invalid argument
Nov 16 22:03:50 pc-eos kwin_wayland[1189]: Atomic modeset test failed! Invalid argument
Nov 16 22:03:50 pc-eos kwin_wayland[1189]: Atomic modeset test failed! Invalid argument
Nov 16 22:03:50 pc-eos kwin_wayland[1189]: Atomic modeset test failed! Invalid argument
Nov 16 22:03:50 pc-eos kwin_wayland[1189]: Atomic modeset test failed! Invalid argument
Nov 16 22:03:50 pc-eos polkit-kde-authentication-agent-1[1385]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos kded6[1323]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos kactivitymanagerd[1377]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos ksecretd[1825]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos konsole[5956]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos xdg-desktop-portal-kde[1629]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos kwalletd6[2801]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos baloorunner[2977]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos python[1478]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
Nov 16 22:03:50 pc-eos kdeconnectd[1479]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos org_kde_powerdevil[1386]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos plasmashell[1344]: There are no outputs - creating placeholder screen
Nov 16 22:03:50 pc-eos plasmashell[1344]: requesting unexisting screen available rect -1
Nov 16 22:03:50 pc-eos systemd[1122]: Started dbus-:1.2-org.kde.KSplash@1.service.
Nov 16 22:03:54 pc-eos kactivitymanagerd[1377]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos xdg-desktop-portal-kde[1629]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos python[1478]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
Nov 16 22:03:54 pc-eos polkit-kde-authentication-agent-1[1385]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos kdeconnectd[1479]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos kwalletd6[2801]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos baloorunner[2977]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos ksecretd[1825]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos kded6[1323]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos konsole[5956]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos org_kde_powerdevil[1386]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos plasmashell[1344]: There are no outputs - creating placeholder screen
Nov 16 22:03:54 pc-eos plasmashell[1344]: requesting unexisting screen available rect -1
Nov 16 22:03:55 pc-eos kded6[1323]: Failed to notify “Created too many similar notifications in quick succession”
Nov 16 22:04:19 pc-eos kded6[1323]: Failed to notify “Created too many similar notifications in quick succession”
Nov 16 22:04:24 pc-eos ksecretd[1825]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos xdg-desktop-portal-kde[1629]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos polkit-kde-authentication-agent-1[1385]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos kded6[1323]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos konsole[5956]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos kwalletd6[2801]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos python[1478]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
Nov 16 22:04:24 pc-eos kdeconnectd[1479]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos baloorunner[2977]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos org_kde_powerdevil[1386]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos kactivitymanagerd[1377]: There are no outputs - creating placeholder screen
Nov 16 22:04:24 pc-eos plasmashell[1344]: requesting unexisting screen available rect -1
Nov 16 22:04:24 pc-eos plasmashell[1344]: There are no outputs - creating placeholder screen
Nov 16 22:04:26 pc-eos kded6[1323]: Failed to notify “Created too many similar notifications in quick succession”