ddc-brightness

#!/bin/bash
set -e
# Description:
#		sets the brightess (or contrast) on all monitors defined in $ddc_displays
# Note:
# 		Requires ddcutil i2c-tools packages
#sudo modprobe i2c-dev
if [ "$1" = "detect" ]; then
  ddcutil detect | grep Display -A 1 | awk '{print $3}' | tr '\n' ' '
  echo ''
fi
_set_vcp() {
  # 1 display, 2 feature, 3 value
  sudo ddcutil --sleep-multiplier=0.1 --noverify --skip-ddc-checks --display="$1" setvcp "$2" "$3"
}
#ddc_displays=$(for display in $(cat $XDG_CONFIG_HOME/ddc_displays); do echo $display; done)
#ddc_displays="/dev/i2c-7 /dev/i2c-8 /dev/i2c-4"
# To get your config do:
# echo $(sudo ddcutil detect | grep Display -A 1 | awk '{print $3}' | tr '\n' ' ' ; echo '') > $XDG_CONFIG_HOME/ddc_displays

#for display in $ddc_displays; do
#	bus=${display: -1}
#	[ -z "$bus" ] && continue
#	sudo ddcutil --bus=$bus setvcp 10 $1 &

#	[ -z "$2" ] && continue
#	sleep 0.5 && sudo ddcutil --bus=$bus setvcp 12 $2 &
#done

displays="1"

for display in $displays; do
  _set_vcp "$display" 10 "$1"
  [ -z "$2" ] && continue
  _set_vcp "$display" 12 "$2"
done
printf "\n"