Some other things I've noticed: In the log-in screen (I guess that's sssd, right?), only the screen that is usually working most of the times is on. The other two are off (laptop screen is on). After trying many combinations back and forth in the kde/plasma screen configuration, I did manage to turn on one of the screens. The remaining one will never turn on. And I'm still lacking the kde/plasma menu bar. Killing plasmashell and restarting it won't solve it.