How to brighten LCD?

[sugar3]

Hi, I have Fujitsu Siemens Amilo Pi 2515 with Fedora 10. When I log in LXDE session the LCD shade... I have tried use xbacklight but it doesn't works... Fn+F7 also doesn't works. How to brighten LCD?

[sugar3]

I use xbacklight -dec 1 Strange, but works. It looks like LCD set up on 100% but it is shade after log in LXDE session.