> I just tried a Type 5c keyboard and it did the same thing -- it 
> wouldn't shut down from NetBSD, but would from the OpenBoot prompt.
> 
> I guess it must be related to the Voyager's power management 
> capabilities.
> 
> I'd be happy to test stuff if someone had any ideas how to fix it.

Most likely, the voyager has yet another power management device.

Can you try

	prom_interpret("power-off");

in machdep.c, as a replacement for {tadpole_}powerdown()?

-pk