Dim and Dimmer

A simple Linux GUI application for controlling external monitor brightness and contrast.

Features

• Monitor Control - Adjust brightness and contrast on external monitors via DDC-CI
• Software Dimming - Additional gamma-based dimming for X11 sessions
• Auto-Detection - Automatically detects connected monitors
• Simple Interface - Clean, intuitive sliders for quick adjustments

Installation

From crates.io

cargo install dim-and-dimmer

From Source

git clone https://github.com/rykilleen/dim-and-dimmer.git
cd dim-and-dimmer
cargo build --release
sudo cp target/release/dim-and-dimmer /usr/local/bin/

Requirements

• Linux with X11 (Wayland not yet supported)
• ddcutil installed for monitor control
• xrandr for software dimming
• Membership in i2c group (or root) for DDC-CI access

Installing Dependencies

Debian/Ubuntu:

sudo apt install ddcutil x11-xserver-utils

Fedora:

sudo dnf install ddcutil xrandr

Arch Linux:

sudo pacman -S ddcutil xorg-xrandr

i2c Group Access

For DDC-CI to work without root, add yourself to the i2c group: https://github.com/RyKilleen/dim-and-dimmer```bash sudo usermod -aG i2c $USER

Log out and back in for the change to take effect.

## Usage

1. Launch the application
2. Select your monitor from the dropdown
3. Adjust brightness and contrast with the sliders
4. Optionally use software dimming for additional control

## Desktop Integration

If you installed via the install script, Dim and Dimmer will appear in your application menu. For manual installations, copy the desktop file:

```bash
sudo cp assets/dim-and-dimmer.desktop /usr/share/applications/

License

MIT