I've had the similar problems with bazzite in desktop mode coming back from sleep or screen off, first with Nvidia, then solved by switching to an AMD graphics card, but now it happens there too. I have two workarounds.
-
Try Ctrl+Alt+F1and Ctrl+Alt+F3. You should be able to switch to console then back to desktop/login screen.
-
In KDE Plasma, there's a way to map wake screen to a keyboard button. That worked for me until I reinstalled the OS and never bothered.
I think this is a Plasma or SSDM issue but idk how to report it properly.
Any ideas would be appreciated
That sucks. I get no monitor signal but tty snaps it on. Can you ssh in? It would help you diagnose what is failing