Configure my Dell monitor (EDID not auto-recognised) via VGA manually with xrandr

dell-monitor-vga1-config.sh

#!/bin/sh
# This cvt command calculates the modeline for a 1920×1080 display @ 60Hz
modeline=`cvt 1920 1080 60 | tail -n 1 | cut -d ' ' -f 2-`
modeline_name=`echo ${modeline} | cut -d '"' -f 2`

if xrandr | grep ${modeline_name} > /dev/null; then
  # Mode already exists (probably didn't reboot yet) so don't add it
  echo "Monitor already configured, skipping..."
else
  echo "Adding monitor config modeline from cvt output..."
  xrandr --newmode ${modeline}
  xrandr --addmode VGA1 ${modeline_name}
fi

echo "Switching modes..."
xrandr --output VGA1 --mode ${modeline_name}