From owner-freebsd-mobile Tue May 22 13:21:26 2001 Delivered-To: freebsd-mobile@freebsd.org Received: from resnet.uoregon.edu (resnet.uoregon.edu [128.223.122.47]) by hub.freebsd.org (Postfix) with ESMTP id E4CF637B424 for ; Tue, 22 May 2001 13:21:23 -0700 (PDT) (envelope-from dwhite@resnet.uoregon.edu) Received: from localhost (dwhite@localhost) by resnet.uoregon.edu (8.10.1/8.10.1) with ESMTP id f4MKLEO68309; Tue, 22 May 2001 13:21:14 -0700 (PDT) Date: Tue, 22 May 2001 13:21:14 -0700 (PDT) From: Doug White To: Cc: Subject: Re: power saving/power usage In-Reply-To: <200105140510.PAA04880@hadrian.staff.apnic.net> Message-ID: X-All-Your-Base: are belong to us MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-mobile@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Mon, 14 May 2001 ggm@apnic.net wrote: > > Can somebody give me brief summary on how FreeBSD > interacts with so-called power-saving feature-ettes > on laptops? > > I am suspecting that I get less (apparent) time per > battery charge on UNIX than on Windeath. I am also > suspecting this is because you have to actively frob > the CPU to tell it to [drop clock|drop volts|slow down] > etc. Yes -- FreeBSD does not currently implement processor cycling or any other OS-controlled power saving features, for the most part. You can suspend/resume and sometimes trick the disk into spinning down, but that's about it. -CURRENT has ACPI support so we'll have a daemon that can at least turn off the fans and so forth. Doug White | FreeBSD: The Power to Serve dwhite@resnet.uoregon.edu | www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message