I can't control the brightness of screen the manjaro kde

Support Graphics & Display
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I installed the gnome and kde plasma version, but it still has the same problem, I can’t lower the brightness of my notebook screen. Is my intel driver not installed?

Manjaro KDE PLASMA
KERNEL : 5.9.X
hardware: notebook samsung, drive video onboard intel

2

Given you have provided no data re: your hardware/ software details, It is impossible to say.

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3

Please follow the instructions here: How to provide good information

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