From owner-freebsd-questions@FreeBSD.ORG  Thu Jul 17 18:05:30 2014
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 0ED6F70C
 for <freebsd-questions@freebsd.org>; Thu, 17 Jul 2014 18:05:30 +0000 (UTC)
Received: from smtpb.telissant.net (smtpb.telissant.net [199.233.230.156])
 by mx1.freebsd.org (Postfix) with ESMTP id D77F8206F
 for <freebsd-questions@freebsd.org>; Thu, 17 Jul 2014 18:05:29 +0000 (UTC)
Received: from barrida.3dresearch.com (localhost [127.0.0.1])
 by smtpb.telissant.net (Postfix) with ESMTP id 097A9273B7
 for <freebsd-questions@freebsd.org>; Thu, 17 Jul 2014 13:55:33 -0400 (EDT)
X-Virus-Scanned: amavisd-new at telissant.net
Received: from smtpb.telissant.net ([127.0.0.1])
 by barrida.3dresearch.com (barrida.3dresearch.com [127.0.0.1]) (amavisd-new,
 port 10024)
 with ESMTP id svH7FEO33j6w for <freebsd-questions@freebsd.org>;
 Thu, 17 Jul 2014 13:55:06 -0400 (EDT)
Received: from doncurzio.3dresearch.com
 (pool-108-3-92-199.pitbpa.east.verizon.net [108.3.92.199])
 (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits))
 (No client certificate requested)
 by smtpb.telissant.net (Postfix) with ESMTPSA id 5433227372
 for <freebsd-questions@freebsd.org>; Thu, 17 Jul 2014 13:55:06 -0400 (EDT)
Received: from doncurzio.3dresearch.com (localhost [127.0.0.1])
 by doncurzio.3dresearch.com (Postfix) with SMTP id A2B96A1E47
 for <freebsd-questions@freebsd.org>; Thu, 17 Jul 2014 13:55:05 -0400 (EDT)
Date: Thu, 17 Jul 2014 13:54:58 -0400
From: Janos Dohanics <web@3dresearch.com>
To: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: CPU temperature reading
Message-Id: <20140717135458.6c3a58d14732798685660928@3dresearch.com>
X-Mailer: Sylpheed 3.3.0 (GTK+ 2.24.19; amd64-portbld-freebsd9.1)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 17 Jul 2014 18:05:30 -0000

Hello,

I am getting impossibly low temperature readings on a new system
running FreeBSD 10.0-STABLE #0 r268555 amd64:

# sysctl -a | grep amdtemp
dev.amdtemp.%parent: 
dev.amdtemp.0.%desc: AMD CPU On-Die Thermal Sensors
dev.amdtemp.0.%driver: amdtemp
dev.amdtemp.0.%location: 
dev.amdtemp.0.%pnpinfo: 
dev.amdtemp.0.%parent: hostb4
dev.amdtemp.0.sensor_offset: 0
dev.amdtemp.0.core0.sensor0: 17.2C
dev.amdtemp.1.%desc: AMD CPU On-Die Thermal Sensors
dev.amdtemp.1.%driver: amdtemp
dev.amdtemp.1.%location: 
dev.amdtemp.1.%pnpinfo: 
dev.amdtemp.1.%parent: hostb10
dev.amdtemp.1.sensor_offset: 0
dev.amdtemp.1.core0.sensor0: 19.1C

The BIOS only says CPU temp "Low".

Smartctl shows 30C for hard drive temperatures. The ambient temp in the
room is about 24C - defective CPU thermal sensors?

-- 
Janos Dohanics