Fn key brightness is not working in acer V5 571

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gurusewak Posts 1 Registration date Thursday March 19, 2015 Status Member Last seen March 19, 2015 - Mar 19, 2015 at 08:45 AM
Hello , my Acer v5 571 is with windows 8 and my fn key of brightness is not working while the arrow keys are working fine.
I have tried everything . please help me what should I do.