Many laptops required some HELPER APPLICATION to connect the Fn keys to the brightness. Look again for such an app from this laptop's maker.
I have a Fujitsu-Siemens Amilo Pro V3515 windows xp, but can not get the Function (Fn) button to adjust brightness keys (F8 dimmer and F9 brighter). I want to get the monitor to be brighter on battery power - will fixing the Function (Fn) help, or does that just adjust the computer when it is running on mains power?.
Thank you in advance.