Definitely update us on UE, I've haven't explored the EU or Unity on Linux, and it would be nice to know if they work, because "you can use Godot" doesn't work for everyone.
Except for one, where suspend instantly wakes up the pc and is therefore unusable. But i will figure that out another day.
Is this just an automatic suspend after inactivity? Because if so, I think it the inactivity timeout can be disabled in the settings menu, as a workaround until you can figure it out.