Date: Thu, 11 Oct 2007 02:03:17 +0200 From: Mel <fbsd.mobile@rachie.is-a-geek.net> To: freebsd-mobile@freebsd.org Subject: Re: Management of Thermal Message-ID: <200710110203.21815.fbsd.mobile@rachie.is-a-geek.net> In-Reply-To: <20071011092557.5ffebba1@meijome.net> References: <20071008172756.2aed69e7@meijome.net> <200710101459.05867.fbsd.mobile@rachie.is-a-geek.net> <20071011092557.5ffebba1@meijome.net>
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On Thursday 11 October 2007 01:25:57 Norberto Meijome wrote: > On Wed, 10 Oct 2007 14:59:05 +0200 > > Mel <fbsd.mobile@rachie.is-a-geek.net> 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
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