[gentoo-user] How to dim the display brightness

[Damian]

Hi,

I cannot find the way to dim the brightness of the display on my
laptop. It doesn't seem to be nothing useful in /proc/acpi neither I
can find anything in google.

I would like the brightness of the screen to be dimmed when the
computer is idle for a certain amount of time. Do you have any clues
where I can start digging?

Thanks in advance,
Damian.