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To: bzeeb-lists@lists.zabbadoz.net
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: arch@freebsd.org, phk@phk.freebsd.dk
Subject: Re: Power-Mgt
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In message: <20080318085804.I50685@maildrop.int.zabbadoz.net>
            "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> writes:
: what actually happens to an unrecognized card or a card with no driver
: loaded currently? How much power does an unsued card use and can we do
: anything about that? Are we perhaps already doing something about
: that?

For PCI it is set into D3 state.  Or at least was until this caused a
problem with some raid controllers that didn't follow the rules and
had extra devices that the card used, but that the OS didn't have a
driver for.

For PC Card, the card is powered down entirely.  For CardBus I think
the same.  For USB, ugen takes it, and therefore it is powered up.

Warner