ybacklight

Get brightness

$ ybacklight -get

$ ybacklight -set [50]

$ ybacklight -inc [10]

$ ybacklight -dec [10]

ybacklight [-get] [-set value] [-inc value] [-dec value]

ybacklight controls the display backlight brightness from the command line. It provides a simple interface for getting, setting, and adjusting the screen brightness level as a percentage value.
Brightness can be set to an absolute percentage with -set, or adjusted relative to the current level with -inc and -dec. The -get option queries the current brightness level.
The tool serves as an alternative to xbacklight, providing similar functionality for systems where xbacklight does not work correctly due to driver or hardware differences.

-get

Show current level.

Set to percentage.

Increase by amount.

Decrease by amount.

Hardware dependent. May need permissions. Backlight control.

ybacklight is a backlight control utility, similar to xbacklight, for adjusting display brightness.

xbacklight(1), brightnessctl(1), light(1)