I don't exactly know why this happens, but when I run XFCE4 with a normal monitor, I lose the desktop if I unplug the HDMI cable.
When I plug it back in, the screen is blank. All the apps are still running though.
What I have been doing up til now is switching to ctrl+alt+F1, logging in and killing the
This then restarts the GUI.
Can I get the GUI back without killing it, so that my GUI apps like browsers and editors don't get closed down?