L430 Brightness controls not working FN-(F8/F9)

Hi folks,
I have a problem that can't resolve and hopefully you experts could assist on this issues.
My new L430 has an fn key option (fn-f8/f9) to adjust the screen brightness and it doesn't work as intended. I tried reloading the hotkey features integration and it doesn't help as well.
Anyone could have an idea on what's go wrong? Please kindly advise.
KT

I am not certain that this is your case, but take a look here, maybe it's the same problem...
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L430 Brightness controls not working FN-(F8/F9)

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