How to reduce the brightness of a desktop pc?

Question

I can see the option to reduce the brightness of the screen on my laptop but not on my desktop. Is there a way to adjust this on my pc?

Answer 1

Install graphics driver

Settings > Additional drivers

Option to change brightness should be in settings:

Settings > Brightness & Lock

Do you use latest version of elementary OS?

Answer 2

Install Brightness Controller with the following commands:

sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt update

For Version 1 with up to 4 Monitor Support:

sudo apt-get install brightness-controller-simple

For Version 2 with Multi Monitor Support and other features:

sudo apt install brightness-controller

Note: This does not decrease the intensity of backlight, so won't save your batteries. But you can use this as a last resort to save your eyes.