#!/bin/bash

# control external monitor brightness using ddc/ci

level="$1"

if [ $level -lt 0 ] || [ $level -gt 100 ]; then
    echo "brightness must be between 0 and 100"
    exit 1
fi

dpys=$(ddcutil detect --async | grep Display | cut -f2 -d' ' | tr '\n' ' ')

# NOTE: as nice as it would be, it seems that I can't run all of these in
# parallel since ddc will get confused (idk why)
for d in $dpys; do
    ddcutil setvcp 10 "$level" -d "$d" > /dev/null
done

wait