gddc is a lightweight GTK 4 application to control brightness, contrast, and volume of external monitors on Linux using the DDC/CI protocol, built on top of the command-line tool ddccontrol.

Run the following command to download and install the .deb package:

wget -qO /tmp/myapp.deb https://github.com/lightRajat/monitor-control/releases/download/v1.0-1/gddc_1.0-1_all.deb && sudo apt install /tmp/myapp.deb -y

Add your current user to the i2c group so the app can communicate with your monitor:

sudo usermod -aG i2c $USER

Log out and log back in (or restart your computer) for the permission changes to take effect.

• Target OS: Designed for Debian-based Linux distributions (Ubuntu, Linux Mint, Pop!_OS, Kali, etc.) using the apt package manager.
• Desktop Environment: Requires support for GTK 4 libraries (gir1.2-gtk-4.0).
• Kernel: Relies on a standard Linux kernel with the i2c-dev module enabled for hardware communication.
• Unsupported Platforms: Not compatible with Windows (including WSL), macOS, or non-Debian Linux distros (Arch, Fedora, RPM-based) without manual adaptation.

• Built with GTK 4
• Live control of Brightness, Contrast, and Volume
• Smooth sliders with acceleration and jump-override behavior
• Automatic external monitor detection and correct I2C bus selection

git clone https://github.com/lightRajat/monitor-control.git
cd monitor-control

src/main

Contributions, bug reports, and suggestions are welcome on the GitHub repository.

This project is licensed under the MIT License — you’re free to use, modify, and distribute it.

App icon created by Freepik – Flaticon