DDCcontrol

What DDCcontrol is

DDCcontrol is free Linux software for changing monitor brightness, contrast, color levels and other settings. It offers both a GTK interface and a command-line tool for terminal work, scripts and automation. It communicates with monitors through Linux’s i2c-dev interface and /dev/i2c-* devices, which need to be readable and writable for configuration. USB-connected DDC/CI displays are not supported yet.

A monitor database is required for monitor-specific controls and proper functionality. The ddccontrol-scanmonitor tool can read a connected monitor’s EDID, capabilities and supported controls to create a database XML file; scanning does not change control values. The maker’s database index lists 474 monitor profiles in release 20260928. Installation options include packages for Debian/Ubuntu, Fedora and openSUSE, plus source releases and source builds. The project uses GNU General Public License version 2.0 and links to GitHub Issues for support.

Who it suits

DDCcontrol suits Linux users who want to adjust supported monitor settings through a graphical interface or command line. It may also suit people automating monitor configuration, provided their display connection and device permissions meet its requirements.

Limits

DDCcontrol is for Linux and does not yet support USB-connected DDC/CI displays. Monitor-specific controls require the monitor database, and configuration requires readable and writable /dev/i2c-* devices.

Getting started

1. Visit the DDCcontrol project website.
2. Install a distribution package for Debian/Ubuntu, Fedora, or openSUSE, or use a source release or source build.
3. Ensure the monitor database is available for monitor-specific controls and proper functionality.
4. Make the /dev/i2c-* devices readable and writable for configuration.
5. Use the GTK interface or command-line tool to control monitor settings.

Verdict

DDCcontrol provides graphical and command-line monitor controls for Linux, with a scanner and database for monitor-specific functionality. Check device permissions, database availability and connection support before relying on it.