Windows – Button “Fn” not working for brightness


I have a laptop Sony Vaio VPC-CW21FX after installing windows 8 release preview, my fn key does not work for the screen brightness.
help me solve this problem.

Best Answer

You will need a driver from Sony to get the specialty keys working. This is usually the "HKServ" driver/process (The Hotkey Service).

This may not (yet) be available from Sony as Windows 8 has not been officially released.

You can get a few versions of the HKServer application from Sony's Vaio FTP site here. Perhaps one of them will work for you.