Install ddcci-dkms by entering the following commands in the terminal:
sudo apt update sudo apt install ddcci-dkms
Description:
DDC/CI driver
This set of kernel modules provides a DDC/CI driver for compatible monitors, and integration into the backlight system class. With the latter, many desktop environments can control the backlight on external monitors.
Homepage: https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux
Version: 0.3.1-2
Section: universe/admin