Adjust the laptop's screen brightness from Emacs

Adjust the screen brightness from Emacs If you're using i3wm on Linux, how do you adjust the laptop's screen brightness? Most of the time, I use the laptop with an external monitor. But when I am out, I have no monitors. And it seems no easy way to adjust the brightness in i3wm. Being too bright or dim is terrible for the eyes. Recently, I found a command-line tool called brightnessctl, which can adjust the brightness in a terminal. [Read More]