My desktop uses Kubuntu 24.04, fully updated, with KDE Plasma 5.27.12. About a week ago I decided to give Wayland another try, and this time I found everything to work smoothly, except for the fact that the Screen Energy Saving option does not seem to work...
To be precise, it does work initially, once the idle time has elapsed, and the screen turns black. But it remains black for about 10 seconds only, then the screen comes back on again. Obviously, there is something overriding the settings defined (by me) in System Settings -> Power.
The very same thing happens if I turn off the screen via CLI (kscreen-doctor -d off), i.e. the screen remains black for about 10 seconds, then lights up again. If I choose to put the pc in sleep/hibernate mode after the same amount of time, the screen does not light up again, but this of course is not what I want.
After the screen lights up again, in System Settings -> Display and Monitor, there appears the following information: A new output has been added. Settings have been reloaded. I get in fact the following, interesting, output:
tail -f /var/log/syslog
......
2025-02-14T16:15:20.425314+01:00 kaus kactivitymanagerd[2625]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.425640+01:00 kaus kded5[2563]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.425915+01:00 kaus polkit-kde-authentication-agent-1[2641]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.426185+01:00 kaus foot[2779]: warn: wayland.c:1382: unknown global removed: 0x0000004f
2025-02-14T16:15:20.426443+01:00 kaus DiscoverNotifier[2802]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.426480+01:00 kaus foot: wayland: unknown global removed: 0x0000004f
2025-02-14T16:15:20.426679+01:00 kaus plasmashell[4761]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.426909+01:00 kaus xdg-desktop-portal-kde[3113]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.446383+01:00 kaus org_kde_powerdevil[5644]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.452066+01:00 kaus org_kde_powerdevil[2642]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.456716+01:00 kaus org_kde_powerdevil[5650]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.477425+01:00 kaus org_kde_powerdevil[5644]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:20.487835+01:00 kaus org_kde_powerdevil[5650]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:20.492526+01:00 kaus plasmashell[5655]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.524998+01:00 kaus plasmashell[5655]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:20.566383+01:00 kaus plasmashell[5663]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.571856+01:00 kaus kded5[2849]: xsettingsd: Reloading configuration
2025-02-14T16:15:20.572028+01:00 kaus kded5[2849]: xsettingsd: Loaded 12 settings from /home/mario/.config/xsettingsd/xsettingsd.conf
2025-02-14T16:15:20.573351+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:20.586841+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:20.600327+01:00 kaus plasmashell[5663]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:20.602521+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:20.606076+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:20: TypeError: Cannot read property 'pluginName' of null
2025-02-14T16:15:20.606343+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:75: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.606506+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:78: TypeError: Cannot read property 'pluginName' of null
2025-02-14T16:15:20.606659+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:80: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.606797+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:81: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.606941+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:82: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.607092+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:83: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.607265+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:84: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.607421+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:16: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.607579+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:17: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.607733+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:18: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:20.700216+01:00 kaus kded5[2849]: xsettingsd: Reloading configuration
2025-02-14T16:15:20.700254+01:00 kaus kded5[2849]: xsettingsd: Loaded 12 settings from /home/mario/.config/xsettingsd/xsettingsd.conf
2025-02-14T16:15:20.816145+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL vendor string: Intel
2025-02-14T16:15:20.816430+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL renderer string: Mesa Intel(R) UHD Graphics 630 (CFL GT2)
2025-02-14T16:15:20.816557+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version string: 4.6 (Core Profile) Mesa 24.2.8-1ubuntu1~24.04.1
2025-02-14T16:15:20.816656+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL shading language version string: 4.60
2025-02-14T16:15:20.816745+01:00 kaus kwin_wayland_wrapper[2502]: Driver: Intel
2025-02-14T16:15:20.816825+01:00 kaus kwin_wayland_wrapper[2502]: GPU class: Coffee Lake
2025-02-14T16:15:20.816948+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version: 4.6
2025-02-14T16:15:20.817030+01:00 kaus kwin_wayland_wrapper[2502]: GLSL version: 4.60
2025-02-14T16:15:20.817110+01:00 kaus kwin_wayland_wrapper[2502]: Mesa version: 24.2.8
2025-02-14T16:15:20.817207+01:00 kaus kwin_wayland_wrapper[2502]: X server version: 1.23.2
2025-02-14T16:15:20.817330+01:00 kaus kwin_wayland_wrapper[2502]: Linux kernel version: 6.8
2025-02-14T16:15:20.817448+01:00 kaus kwin_wayland_wrapper[2502]: Requires strict binding: no
2025-02-14T16:15:20.817546+01:00 kaus kwin_wayland_wrapper[2502]: GLSL shaders: yes
2025-02-14T16:15:20.817643+01:00 kaus kwin_wayland_wrapper[2502]: Texture NPOT support: yes
2025-02-14T16:15:20.817738+01:00 kaus kwin_wayland_wrapper[2502]: Virtual Machine: no
2025-02-14T16:15:21.020900+01:00 kaus kwin_wayland_wrapper[2502]: BlurConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.023996+01:00 kaus kwin_wayland_wrapper[2502]: ZoomConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.025121+01:00 kaus kwin_wayland_wrapper[2502]: WindowViewConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.026215+01:00 kaus kwin_wayland_wrapper[2502]: SlidingPopupsConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.026382+01:00 kaus kwin_wayland_wrapper[2502]: SlideConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.026613+01:00 kaus kwin_wayland_wrapper[2502]: OverviewConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.027160+01:00 kaus kwin_wayland_wrapper[2502]: KscreenConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.027885+01:00 kaus kwin_wayland_wrapper[2502]: DesktopGridConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.500242+01:00 kaus org_kde_powerdevil[5682]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:21.532164+01:00 kaus plasmashell[5686]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:21.543067+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:21.543131+01:00 kaus plasmashell[2599]: Checking screens: available: (QScreen(0x5fedb26e8010, name="DP-3")) redundant: QHash() fake: QSet(QScreen(0x5fedb2832170, name="")) all: (QScreen(0x5fedb2832170, name=""), QScreen(0x5fedb26e8010, name="DP-3"))
2025-02-14T16:15:21.607762+01:00 kaus kded5[2849]: xsettingsd: Reloading configuration
2025-02-14T16:15:21.607819+01:00 kaus kded5[2849]: xsettingsd: Loaded 12 settings from /home/mario/.config/xsettingsd/xsettingsd.conf
2025-02-14T16:15:21.724534+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL vendor string: Intel
2025-02-14T16:15:21.724669+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL renderer string: Mesa Intel(R) UHD Graphics 630 (CFL GT2)
2025-02-14T16:15:21.724707+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version string: 4.6 (Core Profile) Mesa 24.2.8-1ubuntu1~24.04.1
2025-02-14T16:15:21.724742+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL shading language version string: 4.60
2025-02-14T16:15:21.724769+01:00 kaus kwin_wayland_wrapper[2502]: Driver: Intel
2025-02-14T16:15:21.724802+01:00 kaus kwin_wayland_wrapper[2502]: GPU class: Coffee Lake
2025-02-14T16:15:21.724829+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version: 4.6
2025-02-14T16:15:21.724918+01:00 kaus kwin_wayland_wrapper[2502]: GLSL version: 4.60
2025-02-14T16:15:21.724948+01:00 kaus kwin_wayland_wrapper[2502]: Mesa version: 24.2.8
2025-02-14T16:15:21.724981+01:00 kaus kwin_wayland_wrapper[2502]: X server version: 1.23.2
2025-02-14T16:15:21.725010+01:00 kaus kwin_wayland_wrapper[2502]: Linux kernel version: 6.8
2025-02-14T16:15:21.725039+01:00 kaus kwin_wayland_wrapper[2502]: Requires strict binding: no
2025-02-14T16:15:21.725071+01:00 kaus kwin_wayland_wrapper[2502]: GLSL shaders: yes
2025-02-14T16:15:21.725102+01:00 kaus kwin_wayland_wrapper[2502]: Texture NPOT support: yes
2025-02-14T16:15:21.725170+01:00 kaus kwin_wayland_wrapper[2502]: Virtual Machine: no
2025-02-14T16:15:21.732241+01:00 kaus kwin_wayland_wrapper[2502]: BlurConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.733999+01:00 kaus kwin_wayland_wrapper[2502]: ZoomConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.735218+01:00 kaus kwin_wayland_wrapper[2502]: WindowViewConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.736053+01:00 kaus kwin_wayland_wrapper[2502]: SlidingPopupsConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.736185+01:00 kaus kwin_wayland_wrapper[2502]: SlideConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.736374+01:00 kaus kwin_wayland_wrapper[2502]: OverviewConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.736800+01:00 kaus kwin_wayland_wrapper[2502]: KscreenConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.737320+01:00 kaus kwin_wayland_wrapper[2502]: DesktopGridConfig::instance called after the first use - ignoring
2025-02-14T16:15:21.807503+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:21.823266+01:00 kaus plasmashell[2599]: message repeated 3 times: [ qt.qpa.wayland: Wayland does not support QWindow::requestActivate()]
2025-02-14T16:15:22.372133+01:00 kaus DiscoverNotifier[2802]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.372448+01:00 kaus foot[2779]: warn: wayland.c:1382: unknown global removed: 0x00000051
2025-02-14T16:15:22.372711+01:00 kaus polkit-kde-authentication-agent-1[2641]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.372930+01:00 kaus kactivitymanagerd[2625]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.373094+01:00 kaus kded5[2563]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.373141+01:00 kaus foot: wayland: unknown global removed: 0x00000051
2025-02-14T16:15:22.373394+01:00 kaus xdg-desktop-portal-kde[3113]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.373731+01:00 kaus plasmashell[4761]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.397611+01:00 kaus org_kde_powerdevil[5726]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.398211+01:00 kaus org_kde_powerdevil[2642]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.404861+01:00 kaus org_kde_powerdevil[5732]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.419837+01:00 kaus org_kde_powerdevil[5726]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:22.427077+01:00 kaus org_kde_powerdevil[5732]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:22.451625+01:00 kaus plasmashell[5738]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.488961+01:00 kaus plasmashell[5738]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:22.521557+01:00 kaus kded5[2849]: xsettingsd: Reloading configuration
2025-02-14T16:15:22.524481+01:00 kaus kded5[2849]: xsettingsd: Loaded 12 settings from /home/mario/.config/xsettingsd/xsettingsd.conf
2025-02-14T16:15:22.547828+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.553843+01:00 kaus plasmashell[5745]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash
2025-02-14T16:15:22.561598+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:22.576030+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:22.577459+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:20: TypeError: Cannot read property 'pluginName' of null
2025-02-14T16:15:22.577520+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:75: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577566+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:78: TypeError: Cannot read property 'pluginName' of null
2025-02-14T16:15:22.577591+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:80: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577613+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:81: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577639+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:82: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577663+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:83: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577686+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:84: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577738+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:16: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577761+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:17: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.577795+01:00 kaus plasmashell[2599]: file:///usr/share/plasma/wallpapers/org.kde.slideshow/contents/ui/main.qml:18: TypeError: Cannot read property 'configuration' of null
2025-02-14T16:15:22.582656+01:00 kaus plasmashell[5745]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:22.674442+01:00 kaus kded5[2849]: xsettingsd: Reloading configuration
2025-02-14T16:15:22.674478+01:00 kaus kded5[2849]: xsettingsd: Loaded 12 settings from /home/mario/.config/xsettingsd/xsettingsd.conf
2025-02-14T16:15:22.800943+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL vendor string: Intel
2025-02-14T16:15:22.801060+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL renderer string: Mesa Intel(R) UHD Graphics 630 (CFL GT2)
2025-02-14T16:15:22.801131+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version string: 4.6 (Core Profile) Mesa 24.2.8-1ubuntu1~24.04.1
2025-02-14T16:15:22.801256+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL shading language version string: 4.60
2025-02-14T16:15:22.801345+01:00 kaus kwin_wayland_wrapper[2502]: Driver: Intel
2025-02-14T16:15:22.801561+01:00 kaus kwin_wayland_wrapper[2502]: GPU class: Coffee Lake
2025-02-14T16:15:22.801704+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version: 4.6
2025-02-14T16:15:22.801839+01:00 kaus kwin_wayland_wrapper[2502]: GLSL version: 4.60
2025-02-14T16:15:22.801982+01:00 kaus kwin_wayland_wrapper[2502]: Mesa version: 24.2.8
2025-02-14T16:15:22.802086+01:00 kaus kwin_wayland_wrapper[2502]: X server version: 1.23.2
2025-02-14T16:15:22.802246+01:00 kaus kwin_wayland_wrapper[2502]: Linux kernel version: 6.8
2025-02-14T16:15:22.802422+01:00 kaus kwin_wayland_wrapper[2502]: Requires strict binding: no
2025-02-14T16:15:22.802565+01:00 kaus kwin_wayland_wrapper[2502]: GLSL shaders: yes
2025-02-14T16:15:22.802709+01:00 kaus kwin_wayland_wrapper[2502]: Texture NPOT support: yes
2025-02-14T16:15:22.802906+01:00 kaus kwin_wayland_wrapper[2502]: Virtual Machine: no
2025-02-14T16:15:22.970701+01:00 kaus kwin_wayland_wrapper[2502]: BlurConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.972646+01:00 kaus kwin_wayland_wrapper[2502]: ZoomConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.973338+01:00 kaus kwin_wayland_wrapper[2502]: WindowViewConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.974403+01:00 kaus kwin_wayland_wrapper[2502]: SlidingPopupsConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.974496+01:00 kaus kwin_wayland_wrapper[2502]: SlideConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.974650+01:00 kaus kwin_wayland_wrapper[2502]: OverviewConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.974989+01:00 kaus kwin_wayland_wrapper[2502]: KscreenConfig::instance called after the first use - ignoring
2025-02-14T16:15:22.975489+01:00 kaus kwin_wayland_wrapper[2502]: DesktopGridConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.144882+01:00 kaus org_kde_powerdevil[5763]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:23.187486+01:00 kaus plasmashell[5769]: Initializing "/usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/kcms/systemsettings/kcm_fonts.so"
2025-02-14T16:15:23.202846+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
2025-02-14T16:15:23.202882+01:00 kaus plasmashell[2599]: Checking screens: available: (QScreen(0x5fedb2715a40, name="DP-3")) redundant: QHash() fake: QSet(QScreen(0x7058b000b3b0, name="")) all: (QScreen(0x7058b000b3b0, name=""), QScreen(0x5fedb2715a40, name="DP-3"))
2025-02-14T16:15:23.241293+01:00 kaus kded5[2849]: xsettingsd: Reloading configuration
2025-02-14T16:15:23.241339+01:00 kaus kded5[2849]: xsettingsd: Loaded 12 settings from /home/mario/.config/xsettingsd/xsettingsd.conf
2025-02-14T16:15:23.372171+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL vendor string: Intel
2025-02-14T16:15:23.372240+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL renderer string: Mesa Intel(R) UHD Graphics 630 (CFL GT2)
2025-02-14T16:15:23.372272+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version string: 4.6 (Core Profile) Mesa 24.2.8-1ubuntu1~24.04.1
2025-02-14T16:15:23.372302+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL shading language version string: 4.60
2025-02-14T16:15:23.372333+01:00 kaus kwin_wayland_wrapper[2502]: Driver: Intel
2025-02-14T16:15:23.372393+01:00 kaus kwin_wayland_wrapper[2502]: GPU class: Coffee Lake
2025-02-14T16:15:23.372425+01:00 kaus kwin_wayland_wrapper[2502]: OpenGL version: 4.6
2025-02-14T16:15:23.372460+01:00 kaus kwin_wayland_wrapper[2502]: GLSL version: 4.60
2025-02-14T16:15:23.372498+01:00 kaus kwin_wayland_wrapper[2502]: Mesa version: 24.2.8
2025-02-14T16:15:23.372537+01:00 kaus kwin_wayland_wrapper[2502]: X server version: 1.23.2
2025-02-14T16:15:23.372572+01:00 kaus kwin_wayland_wrapper[2502]: Linux kernel version: 6.8
2025-02-14T16:15:23.372624+01:00 kaus kwin_wayland_wrapper[2502]: Requires strict binding: no
2025-02-14T16:15:23.372653+01:00 kaus kwin_wayland_wrapper[2502]: GLSL shaders: yes
2025-02-14T16:15:23.372686+01:00 kaus kwin_wayland_wrapper[2502]: Texture NPOT support: yes
2025-02-14T16:15:23.372717+01:00 kaus kwin_wayland_wrapper[2502]: Virtual Machine: no
2025-02-14T16:15:23.384230+01:00 kaus kwin_wayland_wrapper[2502]: BlurConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.386218+01:00 kaus kwin_wayland_wrapper[2502]: ZoomConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.386909+01:00 kaus kwin_wayland_wrapper[2502]: WindowViewConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.387691+01:00 kaus kwin_wayland_wrapper[2502]: SlidingPopupsConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.387765+01:00 kaus kwin_wayland_wrapper[2502]: SlideConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.387968+01:00 kaus kwin_wayland_wrapper[2502]: OverviewConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.388367+01:00 kaus kwin_wayland_wrapper[2502]: KscreenConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.388886+01:00 kaus kwin_wayland_wrapper[2502]: DesktopGridConfig::instance called after the first use - ignoring
2025-02-14T16:15:23.489964+01:00 kaus plasmashell[2599]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
from which we can see that kactivitymanager, for some unspecified reason, decides that it must create a fake Qt screen to avoid it crashing. And this happens several times in the course of a few seconds, until the situation stabilizes, and there are no more related activities in syslog.
Another important detail is added by a capture of the dbus connections:
date > cap.txt; kscreen-doctor --dpms off; dbus-monitor --profile >> cap.txt
and the content of the capture file, cap.txt, is:
Fri Feb 14 04:08:49 PM CET 2025
#type timestamp serial sender destination path interface member
# in_reply_to
sig 1739545729.278759 2 org.freedesktop.DBus :1.68 /org/freedesktop/DBus org.freedesktop.DBus NameAcquired
sig 1739545729.278766 4 org.freedesktop.DBus :1.68 /org/freedesktop/DBus org.freedesktop.DBus NameLost
mc 1739545730.964295 280 :1.41 :1.49 /org/freedesktop/portal/desktop org.freedesktop.impl.portal.Background GetAppState
mr 1739545730.965055 239 :1.49 :1.41 280
mc 1739545730.966093 281 :1.41 :1.43 /org/freedesktop/impl/portal/PermissionStore org.freedesktop.impl.portal.PermissionStore Lookup
err 1739545730.966962 71 :1.43 :1.41 281
mc 1739545735.968323 282 :1.41 :1.49 /org/freedesktop/portal/desktop org.freedesktop.impl.portal.Background GetAppState
mr 1739545735.969096 240 :1.49 :1.41 282
mc 1739545735.970145 283 :1.41 :1.43 /org/freedesktop/impl/portal/PermissionStore org.freedesktop.impl.portal.PermissionStore Lookup
err 1739545735.970998 72 :1.43 :1.41 283
sig 1739545740.179599 187 :1.26 <none> /kwinrc org.kde.kconfig.notify ConfigChanged
mc 1739545740.180923 389 :1.21 org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus AddMatch
The initial time of the dbus capture, 1739545729, corresponds to Friday, February 14, 2025 4:08:49 PM GMT+01:00, which is also the output of the date command immediately before the command that turns off the monitor. We see that about 11 seconds after the turning off kwin sends out a signal that the configuration has changed, which presumably is the consequence of kded5 having created a fake Qt screen. But what exactly triggers this funny behavior?
The amusing thing is that the very same configuration works flawlessly in an X11 session, it is broken only in a Wayland session. But despite this, it is not clear to me at all whether this is a Wayland or a KDE bug. I googled qt.qpa.wayland: Creating a fake screen in order for Qt not to crash, which leads to a meager two references, the most relevant of which states:
The issue is most likey in wayland or the DE as they are not closing the portal,
(whatever the portal may be). But here too, no consensus was reached as to the real culprit.
Can anyone help? I am at a loss, thank you.
