Date: Mon, 21 Dec 2009 23:29:43 -0800 (PST) From: James Phillips <anti_spam256@yahoo.ca> To: freebsd-current@freebsd.org Subject: Re: Systems running hot? Message-ID: <296806.84549.qm@web65508.mail.ac4.yahoo.com> In-Reply-To: <20091221215204.AC4EC1065818@hub.freebsd.org>
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> Date: Mon, 21 Dec 2009 13:26:26 +0100
> From: Dag-Erling Sm?rgrav <des@des.no>
> Subject: Re: Systems running hot?
> To: Doug Barton <dougb@FreeBSD.org>
> Cc: freebsd-current@freebsd.org
> Message-ID: <861viosebx.fsf@ds4.des.no>
> Content-Type: text/plain; charset=utf-8
>
> Doug Barton <dougb@FreeBSD.org>
> writes:
> > In the last weeks (I generally update to the latest
> HEAD daily) It
> > seems that my -current laptop is running hot
> temperature wise, even
> > when it's idle, or nearly so. The temperature sensor
> (via wmbsdbatt)
> > generally stays in the 80s C, as opposed to the 70s,
> and the fan is
> > regularly on its "medium" speed as opposed to the low
> speed.
As far as I can gather, Intel considers the relationship between sensor readings and actual temperatures a trade secret. You have to take those numbers with a grain of salt.
If you look at the Hardware monitoring screen in the BIOS you may notice the temperature readings are unitless. I don't think that is an accident, though they roughly correspond to Celsius temperatures.
For a DG31PR based desktop (latest (0068) BIOS revision) I recently observed a cold boot CPU temp starting at 24 and climbing to 30 before I got bored. The reported system temperature went from 65534 -> 65535 -> 0 -> ... -> 4 before I got bored. Temperature probe in case rose from 295K -> 304K (+-1% ~ 22C -> 31 C)(not all measurement guaranteed to be simultaneous)
>
> The maximum operating temperature for a Core 2 Duo is 75
> C. The idle
True, but ACPI reporting 80C does not make it so.
Regards,
James Phillips
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