Comment # 1 on bug 1157431 from Dr. Werner Fink

Btw: Why does

  qdbus --system org.freedesktop.DisplayManager \
    /org/freedesktop/DisplayManager/Seat0 \
    org.freedesktop.DisplayManager.Seat.SwitchToGreeter

not work on Leap 15.1?  I'd like to switch to a second console e.g. vt8 for a
second login screen