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

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Message-ID: <20070805162747.GA30184@sommrey.de>
Date:	Sun, 5 Aug 2007 18:27:47 +0200
From:	Joerg Sommrey <jo@...mrey.de>
To:	Rene Herman <rene.herman@...il.com>
Cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: bad temperature values from w83781d in 2.6.22

Thanks for your reply.

the sensors.conf I'm currently using is provided by Tyan, so this seems
to be ok.  One major difference that I can see: I don't have compute
statements for the CPU temperatures.  If I use your config, I get 7.8°C
:-)

So there is definitely some difference in our hardware environment. OTOH
with the "right" compute statement the problem seems fixable.

BTW: there is another hwmon chip on the board, a w83627hf.  Up to 2.6.21
this was managed by the w83781d driver, too.  Now I use the w83627hf
driver (on the isa bus).  No problem with that part.

-jo

On Sun, Aug 05, 2007 at 01:20:23PM +0200, Rene Herman wrote:
> 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.
> 
-
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