From owner-freebsd-mobile@FreeBSD.ORG Thu Oct 11 00:04:45 2007 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 6F30E16A419 for ; Thu, 11 Oct 2007 00:04:45 +0000 (UTC) (envelope-from fbsd.mobile@rachie.is-a-geek.net) Received: from snoogles.rachie.is-a-geek.net (rachie.is-a-geek.net [66.230.99.27]) by mx1.freebsd.org (Postfix) with ESMTP id B9D8413C469 for ; Thu, 11 Oct 2007 00:03:25 +0000 (UTC) (envelope-from fbsd.mobile@rachie.is-a-geek.net) Received: from localhost (localhost [127.0.0.1]) by snoogles.rachie.is-a-geek.net (Postfix) with ESMTP id 95F8F1CDFC; Wed, 10 Oct 2007 16:03:24 -0800 (AKDT) From: Mel To: freebsd-mobile@freebsd.org Date: Thu, 11 Oct 2007 02:03:17 +0200 User-Agent: KMail/1.9.7 References: <20071008172756.2aed69e7@meijome.net> <200710101459.05867.fbsd.mobile@rachie.is-a-geek.net> <20071011092557.5ffebba1@meijome.net> In-Reply-To: <20071011092557.5ffebba1@meijome.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200710110203.21815.fbsd.mobile@rachie.is-a-geek.net> Subject: Re: Management of Thermal 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: Thu, 11 Oct 2007 00:04:45 -0000 On Thursday 11 October 2007 01:25:57 Norberto Meijome wrote: > On Wed, 10 Oct 2007 14:59:05 +0200 > > Mel wrote: > > Experience with a HP laptop shows this to be not true. It currently is > > working perfectly with a laptop cooling pad and not going anywhere near > > critical values, but before that, we had to use the following in > > /etc/sysctl.conf to prevent the computer from locking up (I suspect that > > the Intel CPU shuts itself down before burning out): > > hw.acpi.thermal.user_override=1 > > hw.acpi.thermal.tz0._PSV="75C" > > hw.acpi.thermal.tz0._CRT="80C" > > > > These values are 5C lower then detected values. I started with 10C lower > > and reached critical too early. 5C works perfectly. Logging the temp[1] > > each minute I could see the effect of the cooling fans once it reached > > 75C. > > Hi Mel, > from man acpi_thermal > hw.acpi.thermal.tz%d._PSV > Temperature to start passive cooling by throttling down CPU, > etc. This value can be overridden by the user. > > which implies is at what temperature it'll use methods other than the fans > to cool down. > > Your experience seems to contradict this (*._PSV = temperature at which > fans kick in) ? thanks, Yes. I never saw cpu frequency change or performance degrade, but fans did kick in. I cannot say with certainty that the fans did not kick at this point before I changed this value, but no more lock ups and also no critical warning/shutdown. Trust me, not for lack of trying. I gotta say though, that a laptop cooling pad works wonders. Machine has been running tinderbox > 36 hours, compiling kde/openoffice and such, meanwhile running desktop applications on the 2nd core and it's at 55 at idle times ~60C when really busy. Quite a difference. -- Mel