After restarting ksmserver several times I've managed to turn on all displays using xrandr and start plasma-desktop, but The Could not start ksmserver message is still present and if I close it anyhow, X restarts.
Sorry for the multipost!
After restarting ksmserver several times I've managed to turn on all displays using xrandr and start plasma-desktop, but The Could not start ksmserver message is still present and if I close it anyhow, X restarts.
Sorry for the multipost!