use xrandr to enable only HDMI1 if connected, LVDS1 otherwise | OBSOLETE; see https://github.com/obfusk/dotfiles

xrandr-fu.bash

#!/bin/bash

if xrandr | grep -q HDMI-1; then
  hdmi=HDMI-1 lvds=LVDS-1
else
  hdmi=HDMI1 lvds=LVDS1
fi

if xrandr | grep ' connected' | grep -q $hdmi; then
  if [ "$1" = both -o "$1" = both_low ]; then
    xrandr --output $hdmi --primary --auto \
           --output $lvds --auto --right-of $hdmi
  else
    xrandr --output $hdmi --primary --auto --output $lvds --off
  fi
else
  xrandr --output $lvds --primary --auto --output $hdmi --off
fi

if [ "$1" = both_low ]; then
  xbacklight -set 7
else
  xbacklight -set 100
fi