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.
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.
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