SUMMARY When the PC is left unattended, the screensaver automatically shows and the the screens normally shut down. In this case, the screen remained on during 3 mins with a low luminosity. This does not occur every time. STEPS TO REPRODUCE 1. Don't the PC until the screens shut down (after showing screen saver) OBSERVED RESULT The screens are frozen with a very low luminosity. Virtual terminal (Ctrl+Alt+F1) does not show, the only way to recover was to hard reboot the PC (by holding the power button) After reboot, journalctl -b -1 shows the following messages (the ones from `kwin_wayland` are shown in yellow): ``` déc. 15 20:12:26 systemd[1]: Started dbus-:1.2-org.kde.powerdevil.backlighthelper@3.service. déc. 15 20:12:27 kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7 déc. 15 20:12:27 kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7 déc. 15 20:12:27 kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7 déc. 15 20:12:27 kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7 déc. 15 20:12:27 kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7 déc. 15 20:12:36 systemd[1]: dbus-:1.2-org.kde.powerdevil.backlighthelper@3.service: Deactivated successfully. déc. 15 20:13:27 kwin_wayland[2760]: atomic commit failed: Argument invalide déc. 15 20:15:04 kwin_wayland[2760]: Atomic modeset test failed! Argument invalide déc. 15 20:15:04 kwin_wayland[2760]: Atomic modeset test failed! Argument invalide déc. 15 20:15:04 kwin_wayland[2760]: Atomic modeset test failed! Argument invalide déc. 15 20:15:04 kwin_wayland[2760]: Atomic modeset test failed! Argument invalide déc. 15 20:15:04 kwin_wayland[2760]: Atomic modeset test failed! Argument invalide déc. 15 20:15:04 kwin_wayland[2760]: Setting dpms mode failed! déc. 15 20:15:04 kwin_wayland[2760]: Atomic modeset test failed! Argument invalide ``` The last two lines being repeated thousands of times (literaly) EXPECTED RESULT The screen should show the login prompt and the virtual terminal should be accressible SOFTWARE/OS VERSIONS Operating System: openSUSE Tumbleweed 20251211 Kernel Version: 6.18.0-2-default (64-bit) KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.20.0 Qt Version: 6.10.1 Graphics Platform: Wayland Processors: 16 × 11th Gen Intel® Core™ i7-11800H @ 2.30GHz Memory: 16 Gio of RAM (15.4 Gio usable) Graphics Processor: llvmpipe External monitor: Acer Technologies S271HL ADDITIONAL INFORMATION Let me know if any further information is needed.
*** This bug has been marked as a duplicate of bug 513151 ***