My laptop has keyboard buttons for adjusting screen brightness. After a Debian Squeeze re-installation, they don't work no more.
[laptop] Acer TravelMate 6592; I use Fn< to decrease the brightness and Fn> to increase it.
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If you can change your brightness with root user by typing:
echo 100 > /sys/class/backlight/<xxx>/brightnes
Then, you can follow this link: https://askubuntu.com/a/82320/301773