Hello. I bought Dell 5521 2weeks ago (8gb ram 1tb hdd i5 1.70ghz). Whatever, now, i can't use my FN+F4/F5 keys. I can't control/change my screen brightness. Other Fn keys are normal. I can use them but just i can't use my brightness. Anyone knows that how can i fix it? What should i do? A person said me that "download the Fn key's driver" but i don't know which driver is.
Thank you.
P.S: I know my english is bad :/ :D