From owner-freebsd-acpi@FreeBSD.ORG Sun Apr 4 16:31:25 2010 Return-Path: Delivered-To: freebsd-acpi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BF6E81065672 for ; Sun, 4 Apr 2010 16:31:25 +0000 (UTC) (envelope-from dana.myers@gmail.com) Received: from mail-gw0-f54.google.com (mail-gw0-f54.google.com [74.125.83.54]) by mx1.freebsd.org (Postfix) with ESMTP id 722658FC0C for ; Sun, 4 Apr 2010 16:31:25 +0000 (UTC) Received: by gwaa20 with SMTP id a20so1393306gwa.13 for ; Sun, 04 Apr 2010 09:31:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :user-agent:mime-version:to:subject:references:in-reply-to :content-type:content-transfer-encoding; bh=TeeLHauuflOIozkBA+WHMKEnoU2dpJVpO3EjiLkPZzw=; b=oNsOOomO9F5nlkDdtCkv74MaKPVU7wGq5qNg2OlMGAYXJ6dyQL1cDA2WPqAK4l0gcA 04+Nix7EH/xY4I73kensy5mIrasta2GXGtvKVZCsyFkiy1M1nPmbTPNxj2pXQlsdReEj QgrswlCZFwobrvx4Bi/qlYh0XBRi9Udz+1PLU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; b=bZ9XgDqS/4eyEvH6G9A7DUNtyccreECfb5216LeC+uPw+BbTAX6FcOUX3/O3Znn07w T4tuAplaWzmGesfy6t/kSYVKNFTGc8fsfIY9abO0J/pWVfqfBKLaih+0xskUcflz0ToP HkDX2w7aVE1V+FvOtwNQ287CDwcqBx4wD9TcM= Received: by 10.101.130.2 with SMTP id h2mr10970007ann.75.1270398684655; Sun, 04 Apr 2010 09:31:24 -0700 (PDT) Received: from [192.168.0.100] (c-76-103-215-220.hsd1.ca.comcast.net [76.103.215.220]) by mx.google.com with ESMTPS id 23sm3042266ywh.45.2010.04.04.09.31.23 (version=TLSv1/SSLv3 cipher=RC4-MD5); Sun, 04 Apr 2010 09:31:23 -0700 (PDT) Message-ID: <4BB8BED1.1090004@gmail.com> Date: Sun, 04 Apr 2010 09:31:13 -0700 From: Dana Myers User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.9) Gecko/20100317 Lightning/1.0b1 Thunderbird/3.0.4 MIME-Version: 1.0 To: freebsd-acpi@freebsd.org References: <4BB69279.6060005@chillt.de> <20100403152134.V35463@sola.nimnet.asn.au> <4BB74BC4.9070409@chillt.de> <20100404012906.I35463@sola.nimnet.asn.au> <1270308642.1455.10.camel@RabbitsDen> <4BB764CC.60500@chillt.de> <1270334546.1455.45.camel@RabbitsDen> <4BB7C937.9050106@chillt.de> <1270337076.1455.60.camel@RabbitsDen> <4BB7D71C.7080303@chillt.de> <1270341153.1455.81.camel@RabbitsDen> <4BB8B603.60902@chillt.de> In-Reply-To: <4BB8B603.60902@chillt.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Spurious thermal shutdowns on Dell Studio 1557 X-BeenThere: freebsd-acpi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: ACPI and power management development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Apr 2010 16:31:25 -0000 On 4/4/2010 8:53 AM, Bartosz Fabianowski wrote: > >> Theoretically, your laptop should be able to run with CPU stuck at >> its highest frequency without shutting down. > > I agree. This is precisely what I am trying to achieve. [Coming into this thread late] Why do you think that's true? While this is desirable, it's certainly possible that the machine was built with a thermal design that is unable to achieve this, and depends on software to reduce CPU P-state to avoid shut-down. One example I've seen is the Acer Ferrari 3400, which would run the CPU at P0 (full clock rate) by default, but after a few minutes of aggressive use (like, building a kernel), would drop the highest CPU state to P1 (10% slower) via a GPE. This notebook simply can't run the CPU at a full clock rate load for more than a few minutes before it overheats, apparently by design. Thermal design in notebooks seems to be quite tricky. Dana