I use Windows XP and there is no way I can make the brightness keys (Fn + F7 & F8) work. I know there was a bug with an older version of QuickLauch Buttons drivers and that there's also a problem with new Intel drivers released for X3100.
The fact is that I've tried almost everything. I always do fresh installs of Windows XP from a license I own (despite HP fully supports XP and gave me a downgrade to XP from Vista for free). Installing the right (bug free) driver combination HP advices only works until I reboot, downloading the Intel driver from his own page and not installing any quicklaunch driver dones not work neither...
I tried every combination possible, and always installing a fresh Windows wihtout any old driver or HP preloaded driver. Even without installing any driver (quicklaunuch buttons or Intel x31000), brightness keys don't work. They stop working when login screen loads in the Windows XP startup.
Insert your xp cd and reboot it................for more info contact http://tinyurl.com/m7ghqz
Locate the Fn (Function) key on your keyboard.
It may be on the bottom left side with dark blue letters.
Locate the two "brightness" keys near the top of the keyboard.
These will be in the "F" keys, possibly if F6 and F7.
They should have little sun pictures or something similar to indicate brightness.
Hold down the Fn key while pressing F7, or whichever "F" key your laptop uses to increase brightness.
Tap F7 repeatedly until you reach the desired brightness.
Fn must be held down as you continue to tap.
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