I recently upgraded my homelab to KDE/Plasma 6. It’s running NixOS and is just an old laptop sitting on a counter. I’m having issues with the thing turning off network connectivity when the lid is closed, so it’s always open. Not an issue, since under Plasma 5 the login screen turned itself off after a while. This doesn’t seem to happen anymore under Plasma 6. Power Management related settings like “turn off immediately on screen lock” work, but seem to take effect only when I’m logged in and locking the screen. When there is no active session, this does nothing.
Is this a known issue? Or is there a way make the login screen time out and turn off?
I don’t know the cause of this behaviour change, but the lock screen and the login screen are different code, even though their design is similar.
That explains why the the per-user settings for the lock screen don’t apply there.
When exactly that was changed probably depends on the distribution, but the Plasma 6 upgrade might have coincided with switching SDDM to run on Wayland (kwin_wayland) instead of Xorg, which could explain the change.
Interesting. I’ll keep monitoring this to figure out if perhaps that’s just a temporary glitch and not happening consistently (had such cases under Plasma 5). If it is consistent, I have a bit of a thread now, to follow up. Thanks!