How to setup brightness?

Hi, changing brightness with my “Fn+home or end” (sun up or sun down) will not change my brightness rather change my gamma. so i manualy change this in /sys/class/backlight/acpi…/brightness. The value was 0 and i changed it to 13. Now it’s okay, but is it possible to use my keys that are destinated for?

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I found some tips here “Brightness issue”, see if this helps.