Fujitsu Siemens Pa 2510
ETHERNET
works out of the box using the r8169 module.
HOTKEYS, SPECIAL BUTTONS
The buttons for the led brightness didn't work until I added
acpi_osi=linux
to grub.
Powersave
add "powernow_k8" to the modules section in rc.conf
for frequency scaling you should search the wiki for laptop-mode-tools.