Automatic configuration of monitors for my vostro laptop + other monitors - Put this in /etc/X11/xinit/xinitrc.d

66-xrandr-monitors.sh

#!/bin/sh

# array of connected monitors
monitors=( $(xrandr | grep ' connected ' | cut -d' ' -f1) )

# for the integrated display, set a higher resolution
if [ ${#monitors[@]} -eq 1 ]; then
    xrandr --output $monitors --mode 1366x768 --panning 1920x1080 --scale 1.41

# for multiple monitors, enable them all
elif [ ${#monitors[@]} -gt 1 ]; then
    last="${monitors[0]}"
    configs="--output $last --auto --primary"
    for monitor in ${monitors[@]:1}; do
        configs="$configs --output $monitor --auto --right-of $last"
        last="$monitor"
    done
    xrandr ${configs[@]}
    unset last
    unset configs
fi

unset monitors