Please show the output from xrandr --verbose. If the HDMI output shows not connected, replug the connectors, and perhaps power-cycle the projector.
Also, show the results from kscreen-doctor -o
Please show the output from xrandr --verbose. If the HDMI output shows not connected, replug the connectors, and perhaps power-cycle the projector.
Also, show the results from kscreen-doctor -o