Virtual Display VNC-Server

vnc-server.sh

#!/bin/bash
# https://github.com/dianariyanto/virtual-display-linux/
# https://bbs.archlinux.org/viewtopic.php?id=180904
# https://unix.stackexchange.com/questions/378373/add-virtual-output-to-xorg

set -euo pipefail
set -x

resolution="1920x1080"
screen="HDMI-2"

echo "Configuring monitor $screen to $resolution"
if ! ( xrandr | grep -Pzo ".*$screen'.*\n(\s+.*\n)+" | grep -E "\s$resolution\s" ); then
    if ! ( xrandr | grep -E "\s$resolution\s" ); then
        xrandr --newmode $resolution $(cvt ${resolution/x/ } 60.02 | grep "^Modeline" | sed -E 's/Modeline\s+"[^"]+"\s+//')
    fi
    xrandr --addmode $screen $resolution
fi
xrandr --output $screen --mode $resolution --right-of eDP-1
echo "started display $screen to $resolution"

trap "xrandr --output $screen --off &" 0 1 3 6 14 15

killall /usr/bin/x0vncserver || true
echo "starting x0vncserver"
x0vncserver \
    -rfbauth ~/.vnc/passwd \
    -AcceptKeyEvents=off -AcceptPointerEvents=off -AcceptSetDesktopSize=off \
    -Geometry=$resolution+1920+0 \
#    -FrameRate 15 \



xrandr --output $screen --off

I never see it appear in my XFCE4 screen settings

I use cinnamon, but it won't appear in its display settings either. I can move windows over to the virtual monitor though, and in arandr (like a gui for xrandr).

Maybe XFCE does some things different so it won't work. You maybe need a dummy HDMI plug