### What do you need?

This is the code that worked for me to control the brightness of the external monitor in a setup of an EQ minipc with only one monitor connected by HDMI. 

Not  sure if this should be included in Omarchy and how to do it. I'm just leaving it here in case someone needs it or know how to implement it on the Omarchy defaults. 

It can be tweaked to control multiple displays. 

Based in this gist: https://gist.github.com/negoro26/c59167fb4c08da46c4e08e1fdcd7aeb1

https://github.com/user-attachments/assets/07b046a4-9398-4ad1-a47c-5adb59a5bebe

#  ~/.config/waybar/config.jsonc
```json
  "modules-right": [
    ...
    "custom/brightness"
  ],
```

```json
  "custom/brightness": {
    "format": " {text}%",
    "signal": 8,
    "exec": "~/.config/waybar/brightness-control.sh get",
    "on-scroll-up": "~/.config/waybar/brightness-control.sh up",
    "on-scroll-down": "~/.config/waybar/brightness-control.sh down",
    "on-click": "~/.config/waybar/brightness-control.sh left_click",
    "on-click-right":  "~/.config/waybar/brightness-control.sh right_click",
    "tooltip": false
  },
```

#  .config/waybar/brightness-control.sh
```bash
#!/bin/bash

# --- CONFIGURATION ---
DISPLAY_NUM=1
STEP=5
STATE_FILE="/tmp/waybar_brightness.tmp"
# ---------------------

# Function to send the actual DDC/CI command in the background
set_brightness_in_background() {
    pkill -f "ddcutil.*setvcp 10"
    (ddcutil --display $DISPLAY_NUM setvcp 10 $1) &
}

if [ ! -f "$STATE_FILE" ]; then
    initial_brightness=$(ddcutil --display $DISPLAY_NUM getvcp 10 -t | cut -d ' ' -f 4)
    echo "$initial_brightness" > "$STATE_FILE"
fi

current=$(cat "$STATE_FILE")

case "$1" in
    "get")
        echo " $current"
        ;;
    "up")
        new_brightness=$((current + STEP > 100 ? 100 : current + STEP))
        if [ "$current" -ne "$new_brightness" ]; then
            echo "$new_brightness" > "$STATE_FILE"
            set_brightness_in_background "$new_brightness"
        fi
        pkill -RTMIN+8 waybar # Can add whatever RTMIN+n you please, as long as it's an integer. Make sure the signals match between the config and script.
        ;;
    "down")
        new_brightness=$((current - STEP < 0 ? 0 : current - STEP))
        if [ "$current" -ne "$new_brightness" ]; then
            echo "$new_brightness" > "$STATE_FILE"
            set_brightness_in_background "$new_brightness"
        fi
        pkill -RTMIN+8 waybar
        ;;
    "right_click")
	new_brightness=0
	if [ "$current" -ne "$new_brightness" ]; then
            echo "$new_brightness" > "$STATE_FILE"
            set_brightness_in_background "$new_brightness"
        fi
        pkill -RTMIN+8 waybar
        ;;
    "left_click")
	new_brightness=100
     	if [ "$current" -ne "$new_brightness" ]; then
            echo "$new_brightness" > "$STATE_FILE"
            set_brightness_in_background "$new_brightness"
        fi
        pkill -RTMIN+8 waybar
        ;;
esac
```