Date: Wed, 19 Mar 2008 05:16:04 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: bzeeb-lists@lists.zabbadoz.net Cc: arch@freebsd.org, phk@phk.freebsd.dk Subject: Re: Power-Mgt Message-ID: <20080319.051604.63052713.imp@bsdimp.com> In-Reply-To: <20080318085804.I50685@maildrop.int.zabbadoz.net> References: <3860.1205764623@critter.freebsd.dk> <20080318085804.I50685@maildrop.int.zabbadoz.net>
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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
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