linux-kernel - Re: bad temperature values from w83781d in 2.6.22

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Message-ID: <46B5B277.8060402@gmail.com>
Date:	Sun, 05 Aug 2007 13:20:23 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Joerg Sommrey <jo@...mrey.de>
CC:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: bad temperature values from w83781d in 2.6.22

On 08/05/2007 12:26 PM, Joerg Sommrey wrote:

> after upgrading from 2.6.21 to 2.6.22 the CPU temperatures shown by
> w83781d look unreal.  They were in a range from 40°C when idle to
> 75°C under full load with 2.6.21.  The values shown now are in a very
> small range from 77°C to 82°C.  From the (low) noise of the fan I can
> tell that the temperature is <50°C.
> The third temperature shown is completely wrong.
> 
> I have a Tyan Tiger MPX board with a w83782d chip. Output from
> "sensors":
> 
> w83782d-i2c-0-2d
> Adapter: SMBus AMD768 adapter at 80e0

As a datapoint, the same W83782D on AMD756 (also I2C) works correctly with 
2.6.22:

w83782d-i2c-0-2d
Adapter: SMBus AMD756 adapter at 50e0

Jean Delvare recently worked on the ISA interface to these chips but it 
seems this would not be the cause if you are also using I2C. Our hardware 
appears rather identical...

I've attached (an excerpt of) my /etc/sensors.conf -- I once dug through the 
datasheets for those compute lines for example so perhaps its still useful 
even if 2.6.21 working for you probably means you don't have a config problem.

Rene.

View attachment "sensors.out" of type "text/plain" (1141 bytes)

View attachment "sensors.conf" of type "text/plain" (2536 bytes)