#!/bin/bash

# configure the display names with "xrandr"
LAPTOP=LVDS1
ANALOG=VGA1
DIGITAL=HDMI1
# You hay have to change ANALOG/DIGITAL in the outputs, especially for Workstation choices

if [ -z "$1" ]
then 
   echo 'Choose display mode:
   1) Laptop only
   2) Presentation (2nd arg for gamma correction)
   3) Workstation with 2nd screen
   4) External display only
   '
   read i
else 
    i=$1
fi
if [ -z "$2" ]
then g=1
else g=$2
fi

case $i in
    1) xrandr --output $LAPTOP --auto --gamma $g:$g:$g --output $ANALOG --off --output $DIGITAL --off ;;
    2) xrandr --output $LAPTOP --mode 1024x768 --pos 0x0 --output $ANALOG --mode 1024x768 --pos 0x0 --gamma $g:$g:$g ;;
    3) xrandr --output $LAPTOP --auto --output $ANALOG --auto --right-of $LAPTOP ;;
    4) xrandr --output $LAPTOP --off --output $ANALOG --auto ;;
esac