Today I discovered brightnessctl to adjust the screen brightness on my
AwesomeWM machine. Its a command line utility that you can use to adjust the
brightness of your screen. A command line interface like this gives you the
ability to bind keys with something like [[xbindkeys]] or your window manager
configuration.
sudo apt install brightnessctl
# or
paru -S brightnessctl
Now that you have it installed you can use it to adjust the brightness of your screen, this worked particularly well for my laptop screen, I don’t think this works for monitors, in my experience they are usually controlled by the built in osd.
# Increase brightness by 10%
brightnessctl set +10%
# Decrease brightness by 10%
brightnessctl set 10%-
# Set brightness to 50%
brightnessctl set 50%
# Set brightness to 100%
brightnessctl set 100%
Note
on my machine I had to use `sudo` to run the command, otherwise I got the following error:
Can't modify brightness: Permission denied
You should run this program with root privileges.
Alternatively, get write permissions for device files.