EbonJaeger
Yes, thanks. I wanted to add some information to that, but I couldn't find it.
My VM host laptop dual boots between Solus and Sparky Linux, and I have them set up the same. In order to see whether this is a Solus bug, I logged on to a Wayland session on Sparky, created a Solus Budgie VM there, and sent it to full-screen.
That immediately locked up both the VM and the Sparky host, in exactly the same way it locks up Solus, so it has to be a upstream bug, not Solus' problem. (Unless someone here can fix it easily.)
I have an account on the KDE forum, so I'll check to see if it's been reported there, and if not, I'll file a bug there.
EDIT: The VM lockup happens after the VM has gone to full-screen, so the host lockup may just be because the VM by then is covering up the host's screen, preventing the user from shutting down the VM or rebooting the host.
