Hi!
> Fastpoweroff allows a user to power down the system without using rc kill
> scripts. This is used in the advent of a battery operated device about to lose
> power. The user interface is vis sysfs /sys/power/fastpoweroff. A simple cat of
> the fastpoweroff will list any registered profiles. To invoke
> the profile sequence, echo {profile name} > /sys/power/fastpoweroff.
No, we do not want "poweroff profiles" in kernel. Sorry.
rc kill scripts should be fast enough, if not, fix them. If it is
impossible (time is spent in kernel waiting for network card to shut
off), fix that.
What you want is pretty much "echo b > ..../sysrq; halt --now".
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
