semicolon.in.th Programming is real fun!

Reference: http://www.thinkwiki.org/wiki/LCD_Brightness

Full brightness
echo 100 > /proc/acpi/video/VID1/LCD0/brightness

Totally Dim
echo 20 > /proc/acpi/video/VID1/LCD0/brightness

Note: brightness value must be in this set [20, 30, 40, ... 100]