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.

List all compatible displays:

ddcutil detect

Change the brightness (option 0x10) of display 1 to 50%:

ddcutil --display {{1}} setvcp {{10}} {{50}}

Increase the contrast (option 0x12) of display 1 by 5%:

ddcutil -d {{1}} setvcp {{12}} {{+}} {{5}}

Read the settings of display 1:

ddcutil -d {{1}} getvcp {{ALL}}