Not sure if this is the right place to ask. I have been experiencing this issue for a while now. I'm convinced it's something to do with my monitor setup. When I use a Wayland session my monitors refuse to sleep! On X11 they sleep as expected when the screen is locked. On Wayland they go to sleep, flash the "entering power save" message and then turn back on. Here is my current and previous setups that both experienced the exact same issue.