#run as root
#to get commands for each device 'cat' the device
#example:
cat beep
status:		supported
commands:	<cmd> (<cmd> is 0-17)

#system beeps
cd /proc/acpi/ibm
for i in {0..17};
do 
  echo "$i"|tee beep
  sleep 1
done

#turn light on and off
echo on > light
echo off > light
#or
echo 12 > cmos
echo 13 > cmos

#leds - most slots not used on the T400
for i in {0..15};do echo $i off|tee led;done
for i in {0..15};do echo $i on|tee led;done
for i in {0..15};do echo $i blink|tee led;done

#dim screen - 5
for i in {0..20};do echo 5 > cmos;sleep .1;done

#brighten screen - 4
for i in {0..20};do echo 4 > cmos;sleep .1;done

#more notes:
http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/Documentation/ibm-acpi.txt?v=2.6.11.8