BrightCtrl

Adjust brightness of your monitors right from the terminal.

Install

Arch Linux (AUR)

yay -S brightctrl

npm

npm install -g brightctrl

Or run without installing:

npx brightctrl

Getting Started

1. Install ddcutil:

   • Arch / Manjaro: sudo pacman -S ddcutil
   • Debian / Ubuntu: sudo apt install ddcutil
   • Fedora: sudo dnf install ddcutil

2. Add yourself to the i2c group and load the kernel module:

   sudo usermod -aG i2c $USER
   sudo modprobe i2c-dev

3. Log out and back in (or restart).

4. Run brightctrl and adjust away.

Controls

Key	Action
↑ ↓	Pick a monitor
← →	Turn brightness down/up
s	Sync — adjust all monitors at once
r	Refresh monitor list
q	Quit

Toggle precise mode with p for 1% steps instead of 5%.

Brightness changes are saved automatically and restored on next launch.