From: Nikos Chantziaras <realnc@arcor.de>
To: gentoo-user@lists.gentoo.org
Subject: [gentoo-user] Re: lm_sensors much hotter in 2.6.31 than 2.6.28
Date: Mon, 26 Oct 2009 17:04:13 +0200 [thread overview]
Message-ID: <hc4dpd$lhe$1@ger.gmane.org> (raw)
In-Reply-To: <49bf44f10910251437q530ddecdv4a669d2587e70f79@mail.gmail.com>
On 10/25/2009 11:37 PM, Grant wrote:
> After upgrading from 2.6.28 to 2.6.31, I noticed my CPU temperatures
> are reported a full 20C hotter. If I load the old kernel, the
> reported temperatures drops back down to normal. Has anyone else seen
> this?
If you're using coretemp as sensor, the temps are always off (the
coretemp sensor of Intel chips is not accurate, not by any stretch of
the imagination.) It only reports the distance to the CPU's maximum
thermal junction, which then the coretemp driver *tries* to translate
into a temperature, but the result is wrong since the value reported by
the CPU is not accurate to start with (it only gets accurate as you
approach the max value). That maximum value is totally undocumented for
desktop CPUs (the docs Intel provided recently are wrong.)
You should use your mainboard's sensors instead for accurate values.
next prev parent reply other threads:[~2009-10-26 15:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-25 21:37 [gentoo-user] lm_sensors much hotter in 2.6.31 than 2.6.28 Grant
2009-10-25 21:39 ` Volker Armin Hemmann
2009-10-25 21:44 ` Grant
2009-10-26 14:25 ` Paul Hartman
2009-10-26 15:04 ` Nikos Chantziaras [this message]
2009-10-26 19:44 ` [gentoo-user] " Grant
2009-10-26 19:55 ` Volker Armin Hemmann
2009-10-26 19:56 ` Paul Hartman
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