I bought Asus FX553VE somedays back. I installed Linux Mint 18.3 as I use Linux for most of my work. I noticed Fn (function) combination is not working for brightness and key board backlight. I tried every method provided on Ubuntu Forums and ever where else but no use.
One method worked but only to control KEYBOARD BACKLIGHT i.e Installing kernel 4.15.One can install 4.15 kernel in Linux Mint by following steps:
- Goto Update Manager -> View -> Linux kernels
- Then Goto 4.15 -> 4.15(latest one which is at top) -> Install
This is can make Fn + Keyboard backlight working. But Brightness is still broken. Hope future kernels will add brightness control support. (Even Nvidia drivers didnt get install. Nvidia PPA installs driver correctly.)