Hi there, I have installed the latest updates to my laptop under KDE Neon and since that the lock screen hangs every time. Usually it hangs after the lock screen appeared, for example after I press Meta+L that is binded to invoke lock screen, before turn off the display. Even clock is being stoppe…

KDE 6.5.5 has been released. It solved the issue.

If it helps, i’ve found these messages in log files: $ sudo grep -i screenlock /var/log/syslog 2025-12-21T04:12:06.107968+04:00 laptop dbus-daemon[1200]: [system] Activating via systemd: service name=‘net.reactivated.Fprint’ unit=‘fprintd.service’ requested by ‘:1.149’ (uid=1000 pid=76193 comm=“/li…

I had the same issue maybe one or two weeks ago. It seems to be fixed already, for I’m no longer experiencing it. Executing kwin_wayland --replace using ssh or KDE Connect fixed it.

[image] ostfriese4: It seems to be fixed already Unfortunately, just restarted my laptop after the screenlock hangs again.

According to release schedule page Schedules/Plasma 6 - KDE Community Wiki , KDE Neon 6.5.5 with the fix is going to be released in a month from now. Is it possible to roll back the update and get back to 6.5.3?

Can verify this. Since the update I’m no longer seeing the issue.

Lock screen hangs

Help

alex55 December 21, 2025, 6:35pm 5

2025-12-21T16:54:30.446395+04:00 laptop kwin_wayland[2016]: Atomic modeset test failed! Invalid argument
2025-12-21T16:54:30.446568+04:00 laptop kwin_wayland[2016]: Setting dpms mode failed!

Looks like it’s the same problem that is described here: