ddcutil

Control the settings of connected displays via DDC/CI. This command requires the kernel module i2c-dev to be loaded. See also: modprobe. More information: https://www.ddcutil.com.

ddcutil detect

ddcutil --display 1 setvcp 10 50

ddcutil -d 1 setvcp 12 + 5

ddcutil -d 1 getvcp ALL