Sun Ultra 5, "poweroff" without keyboard (off-topic?)

[Sebastian Niehaus <killedbythoughts@mindcrime.net>]

Hi, 

i have an Sun Ultra 5 running Debian Sparc. Usually if I want to
switch off a maschine I use the command "poweroff".

Anyway, on my Sun Ultra 5 this command does not power off the computer
as long as the keyboard is not attached. Starting with the keyboard
pluggend, powering off is enabled as well as the switch at the front
of the maschine. 

Is there any way to power down the Ultra 5 by software without
keyboard attached (Which works on the Ultra 1 flawless). 

TIA,


Sebastian