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My button F5 & F6 For Brightness can't run (Lenovo ideapad 3 slim 3)

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I'm new member in ubuntu. I have a little problem and I don't understand about it. please help me...

I'm install ubuntu focal (20.04.2 LTS) in Lenovo ideapad 3 slim 3 intel iris xe i5...

when I up or down brightness with manually using "setting menu > Power". it's okey brightness is running very well...

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but, button for up and down of brightness for my laptop can't run (with f5 & f6 button). how to fix this?

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