I have a system that I am working on that needs to be able to reduce its brightness for power saving reasons. It is running Debian 3.2.68.  
I have tried several approaches to this such as `xbacklight` but the folder `/sys/class/backlight` is empty so it fails with `No outputs have backlight property`. I have tried updating and rebuilding my kernel as well as trying different parameters for `acpi_backlight=` in my `menu.lst` file. Any ideas on what to try from here are greatly appreciated!