Date: Sun, 04 Apr 2010 09:31:13 -0700 From: Dana Myers <dana.myers@gmail.com> To: freebsd-acpi@freebsd.org Subject: Re: Spurious thermal shutdowns on Dell Studio 1557 Message-ID: <4BB8BED1.1090004@gmail.com> In-Reply-To: <4BB8B603.60902@chillt.de> 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>
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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
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