so basically when i put the ubuntu installation disc of Ubuntu 11.10 inside and run a Live session everything works fine (i can press Fn + Arrow Up and Fn + Arrow Down to control the screen Backlight).
But after that i install the system, it doesnt work anymore... but other commands (like Fn + Arrow Left for lowering the volume) are working
i've installed latest nvidia propretary drivers (and maybe thats the issue?), coz i dunno what other drivers i could use
waiting an answer