From owner-freebsd-mobile@FreeBSD.ORG Wed Oct 19 06:13:32 2011 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6A378106564A for ; Wed, 19 Oct 2011 06:13:32 +0000 (UTC) (envelope-from kob6558@gmail.com) Received: from mail-iy0-f182.google.com (mail-iy0-f182.google.com [209.85.210.182]) by mx1.freebsd.org (Postfix) with ESMTP id 389B48FC16 for ; Wed, 19 Oct 2011 06:13:32 +0000 (UTC) Received: by iaky10 with SMTP id y10so2041252iak.13 for ; Tue, 18 Oct 2011 23:13:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=wkTUmN+Q0teDWcl+EOk3NNItC0x/3Tj+F5exiWMAVrA=; b=LwQch4s4/je7qmg9lgjLf8vlNswBh8aIG8ZEjbDhnmjNt91elfGYdWgwz8rSQhYfA2 zShxTsA4HEx0JqFDOiXEgnB+nHW4VkUiomdRPn5bMvmoAFkjxm/WIQHhvoIS7F4A7YVa SwkJJKvMdhvHbOH0IbMZvd65hdWnVLP702YFo= MIME-Version: 1.0 Received: by 10.231.5.73 with SMTP id 9mr2217770ibu.60.1319003092915; Tue, 18 Oct 2011 22:44:52 -0700 (PDT) Received: by 10.231.36.69 with HTTP; Tue, 18 Oct 2011 22:44:52 -0700 (PDT) In-Reply-To: <201110190844.17703.onyx@z-up.ru> References: <201110182335.15862.onyx@z-up.ru> <20111019135942.C21255@sola.nimnet.asn.au> <201110190844.17703.onyx@z-up.ru> Date: Tue, 18 Oct 2011 22:44:52 -0700 Message-ID: From: Kevin Oberman To: Dmitry Kolosov Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-mobile@freebsd.org Subject: Re: Battery charge limiting X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Oct 2011 06:13:32 -0000 On Tue, Oct 18, 2011 at 9:44 PM, Dmitry Kolosov wrote: >> I've never heard of such a theory as limiting charge to prolong battery >> life, not with Lithium Ion batteries anyway; nor have I ever seen any >> such as a BIOS option. =A0'Common' on which brand/s of notebooks? >> >> Can you provide any links to articles discussing this? > > http://hintsforums.macworld.com/archive/index.php/t-104440.html > http://askubuntu.com/questions/34452/how-can-i-limit-charging-capacity-to= - > extend-a-batterys-lifespan > > Lenovo provides such programs with their new products. A program can hold= a > battery at 70-80%% while it not used. > >> I don't think control over a notebook's charging is possible in FreeBSD; >> this is usually managed by an Embedded Controller and ACPI merely passes >> on the the states reported by that and by the battery itself. > > May be modern EC provides some controlling methods or so? Actually, my old IBM ThinkPad started providing this advice after I updated the power management. The issue is with batteries kept at 100% charge for long periods fail more quickly. The power management software stops the charging when it reac= hes 80% of capacity, if you choose to set it that way. This is under the control of the power management software though I assume = that the EC had to have the capabilityto stop the charging. --=20 R. Kevin Oberman, Network Engineer E-mail: kob6558@gmail.com