Solve : Brightness Not changing 8.1 Asus?

1.	Solve : Brightness Not changing 8.1 Asus?
Answer» I have an ASUS x550l and the brightness isn't changing. windows 8.1 I have tryd changing drivers and UPDATING but it doesn't change. More info: CPU: INTEL core I5 - 4200 U, 1.6 HZ Memory: 4 Gb ODD: DVD Sup. MTL. OS: windows 8.1 HDD:750GB Asus X550LTry reinstalling the display adapter from the manufacturers websiteHe already did that... Belkin how OLD is this unit ? ?

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