Created attachment 105959 [details] screens.png See attached screenshot for my display setup. The HDMI-0 monitor is not always on. If I want to activate it is often the case, that with activation of HDMI-0 the DisplayPort-0 monitor turns off (not in the GUI or the virtual display, there are still windows on it etc. but the monitor itself goes in standby). This behaviour is not always reproducible. It happens most of the times. My fix is to deactivate HDMI-0 again, press apply and reactive HDMI-0 and press apply. Sometimes this is enough, sometimes I have to deactivate and reactive a third or forth time. AFAIK this comes with the 5.8 or 5.9 update, for sure I know this was not the case with earlier 5.x versions. I'll try to test with 5.8.
This happens kscreen and libkscreen 5.8.6 as well.
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Unfortunately, I don't have this setup anymore.