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