Finally, set brightness level (e.g., 100) via command: ddcutil -display 1 setvcp 10 100.Replace -display 1 according to last command output. Then find out the feature code for controlling the brightness: ddcutil -display 1 capabilities |grep Brightness.In my case, there’s only one ‘Display 1’. First, run command to detect all connected monitors: ddcutil detect.If you would like to control the monitor brightness from command line, then run commands below one by one: (Optional) Step 3: Change Screen Brightness from command line sudo apt install ddcutilĪfter installing the tool, you need to add your current user to i2c group, for permission to communicate with DDC/CI protocol: sudo gpasswd -add $USER i2c The package is available in all current Ubuntu releases and derivatives such as Linux Mint. When terminal opens, run the command below to install ‘ddcutil’ package. Step 1: Install ddcutilįirstly, open terminal by either searching from system app launcher or pressing Ctrl+Alt+T on keyboard. After enabled the feature via your monitor’s physical settings button, installing ddcutiland its graphical UI will allow you to control the display brightness in Linux desktop. If you have computer monitors purchased in the past few years, DDC/CI should be supported. Most monitors today support DDC/CI, but not many people have heard of it, since most manufacturers do not develop proprietary software for the feature. Have an external monitor supports DDC/CI protocol? There’s a free and open-source graphical tool to control the brightness for your display.ĭisplay Data Channel ( DDC) / Command Interface ( CI) is a type of communication between the computer and the monitor.
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