Cfrgtkky

Created a virtual display so VNC can work when there is no physical display:

/usr/share/X11/xorg.conf.d/20-intel.conf:

Section "Device"

    Identifier "intelgpu0"

    Driver "intel"

    Option "VirtualHeads" "2"

EndSection

Startup script:

#!/bin/bash



/usr/bin/xrandr -d :0 --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync

/usr/bin/xrandr -d :0 --addmode VIRTUAL1 "1600x900_60.00"

/usr/bin/xrandr -d :0

killall -3 gnome-shell

As in https://askubuntu.com/a/1062890/391744

But when plugging in the real monitors they are appearing as secondaries. They show the uninteresting part with no graphical programs visible and no panels/docks.

How to configure it that any non-virtual monitor would automatically become a primary?

For the moment I've only come up with this addition to the script to poll the connected monitors with xrandr:

(

    while [ 1 ]; do

        xrandr_out="$(LANG=C /usr/bin/xrandr -d :0)"

        # If VIRTUAL is primary.

        if egrep -q '^VIRTUAL[0-9]+[[:space:]]+connected[[:space:]]+primary' < <(printf '%sn' "$xrandr_out"); then

            # Find non-virtual that is connected.

            non_virt="$(sed -nre 's/^([^[:space:]]+)[[:space:]]+connected.*/1/p' < <(printf '%sn' "$xrandr_out" | grep -v ^VIRTUAL) | head -n1)"

            if [ -n "$non_virt" ]; then

                xrandr -d :0 --output "$non_virt" --primary --pos 0x0

            fi

        fi

        sleep 10

    done

) & disown