Fn Keys on samsung np900x3c not working

[vivek]

I have installed vsido on my new samsung np900x3c laptop. However, I am unable to make Fn keys work. I have followed the directions provided in
http://natjohan.info/linux-on-samsung-np900x3c.html
However, it did not make the Fn keys function. I will appreciate support for this issue.
Thanks.