How do I change screen brightness in Dietpi

I need help getting the screen brighter using Dietpi, running on debian bullseye.
(07-01-2022, 01:25 PM)computerc Wrote: running on debian bullseye.

I don't know if this is different of debian, but I think the universal way to so this is to modify `/sys/class/backlight/edp-backlight/brightness`.

Easiest way is to run
# cp /sys/class/backlight/edp-backlight/max_brightness /sys/class/backlight/edp-backlight/brightness
To set the backlight to max brightness.

(The "#" means you need root permissions to do this, on debian I believe this is done with `su`, but you may also have `sudo` installed)
I also found out I could use brightnessctl to control, I use sudo "sudo brightnessctl set <value>"

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