From my experience with the patch from Adrian Yee,
provided at http://devrandom.com/fujitsu/

I made it work with an E-Series Fujitsu (E6624)
Kernel 2.6.21.5
No changes needed, just help the kernel Makefile diff succeed by hand.
It's just one link you have to move to the right place.
Look in Makefile.rej for what to add.

# 1. Load the module

modprobe fuj02b1_acpi

# 2. cd to the acpi directory

cd /proc/acpi/fuj02b1/

# 3. LCD Backlight Brightness commands 
# 3.1 display backlight at the dimmest setting (but not off)
echo "brightness:0" > brightness

# 3.2 display backlight at the brightest
echo "brightness:7" > brightness

# 4. Speaker/Volume
# 4.1 this turns the speaker off
echo " mute : 1" > volume 

# 4.2 this turns the speaker back on
echo " mute : 0" > volume

# 4.3 quietest setting possible
echo " volume : 0" > volume

# 4.4 loudest setting possible
echo " volume : 16" > volume

Mad Martin
fujitsu-lcd.10.mmad@spamgourmet.com