Have recently installed Opensuse Leap 15.3, and having problems trying to get the screen to lock/power off.
If I don't log on, screen seems to power off ok, but after logging on, never seems to lock/power off automatically, even when no 'extra' programs are running (ie even just the standard system components.)
Can Manually lock (Meta+L), but still doesn't go to power off.

Screenshots:
ScreenLock Settings: https://drive.google.com/file/d/1tA2eXFJC4vDfOkT9W0AWl6rUto4eDwe6/view?usp=sharing
Energy Saving: https://drive.google.com/file/d/12XZnBktq1_Zwweev7_BP2viZJPlntkYq/view?usp=sharing
Activity Settings: https://drive.google.com/file/d/1p-tFN5oZCXpCHn0ZgCH5KmC9wkpcBVGB/view?usp=sharing
Battery: https://drive.google.com/file/d/1oSs3aPM-usDWTwPJ4KPL5Q6eodlDyBi3/view?usp=sharing

Yes, still having this issue - the only prob I have with KDE, and it is p**sing me off....
Does anyone else have this?
The only apps I run as standard, are : Thunderbird, Vivaldi, Skype, Signal, Strawberry. Have tried closing them individually, doesn't seem to make a difference...

Anyone?
Thanks.

I have this problem same as you exactly, and was not able to find a way to resolve it.

did any of you 3 manage to solve it? i have it set to energy saving switch of after 30 minutes and it only locks all the screens, never turns any of the 3 monitors off.

premier69 wrote:did any of you 3 manage to solve it? i have it set to energy saving switch of after 30 minutes and it only locks all the screens, never turns any of the 3 monitors off.

No, still have this problem, even after changing distro to Tumbleweed - exactly the same. Intermittently works, but most of the time, can walk away from my device for hours, come back, and still not locked/powered down.
Sh*ts me, totally!