A script to fix the resolution on Linux machines when the correct resolution isn't detected

fixres.sh

#!/bin/zsh

# This is a shell script that sets up the resolution and position of the
# external display monitors. Most computers can figure this stuff out on
# their own, but this one can't :(
#
# How to use this script:
#
# Run `xrandr` to see a list of displays ports and make note of the one's that are "connected".
# As an example, if `DP-1` is on the left, and `HDMI-2` is on the right,
# add the following 2 lines to `~/.profile`:
#
#   source ~/fixres.sh
#   fixres DP-1 HDMI-2

resolution="1920x1080_60.00"

createmode() {
  # This mode line was generated using: cvt 1920 1080
  xrandr --newmode $resolution  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
}

setdisplay() {
  [[ $2 == a* ]] && pos="--above"
  [[ $2 == b* ]] && pos="--below"
  [[ $2 == l* ]] && pos="--left-of"
  [[ $2 == r* ]] && pos="--right-of"
  [[ $2 == s* ]] && pos="--same-as"

  xrandr --addmode $1 $resolution

  if [ -n "${2}" ]; then
    xrandr --output $1 --mode $resolution $pos $3
  else
    xrandr --output $1 --mode $resolution
  fi
}

fixres() {
  createmode
  setdisplay $1
  setdisplay $2 right-of $1
}