Re: [lm-sensors] sensor 3.3.1 and previous do not properly detect/show CPUTIN temperature - maximus

[Guenter Roeck <guenter.roeck@ericsson.com>]

On Sat, Apr 28, 2012 at 07:18:46PM -0400, Martin Suchanek wrote:
> 
> 
> On Sat, Apr 28, 2012 at 8:30 PM, Guenter Roeck <guenter.roeck@ericsson.com>
> wrote:
> 
>     On Sat, Apr 28, 2012 at 03:04:51PM -0400, Martin Suchanek wrote:
>     >
>     >
>     > On Sat, Apr 28, 2012 at 4:36 PM, Guenter Roeck <
>     guenter.roeck@ericsson.com>
>     > wrote:
>     >
>     >     On Sat, Apr 28, 2012 at 06:08:23AM -0400, Martin Suchanek wrote:
>     >     >
>     >     >
>     >     > On Sat, Apr 28, 2012 at 5:30 AM, Guenter Roeck <
>     >     guenter.roeck@ericsson.com>
>     >     > wrote:
>     >     >
>     >     >     On Fri, Apr 20, 2012 at 11:47:47AM +0100, Martin Suchanek
>     wrote:
>     >     >     > Hi,
>     >     >     >
>     >     >     > Add info:
>     >     >     > I have found software called open hardware monitor. I have
>     been
>     >     testing
>     >     >     it
>     >     >     > in windows for couple of days and it works properly with
>     Nuvoton
>     >     NST6776F
>     >     >     > chip. I have been comparing results with AI Suite software
>     coming
>     >     from
>     >     >     ASUS
>     >     >     > and results are corresponding and measuring is with big
>     precise. So
>     >     , you
>     >     >     > can have a look to source code and compare with your driver.
>     This
>     >     >     software
>     >     >     > should work on linux as well but I did not try it yet but I
>     will.
>     >     >     >
>     >     >     I finally had time to look into the open hardware monitor code.
>     >     >
>     >     >     The answer is quite simple - the board get the CPU temperature
>     using
>     >     PECI,
>     >     >     which the w83627ehf/nct67765 driver reports is as "PECI Agent
>     0".
>     >     >     Open Hardware Monitor maps that temperature into the CPU
>     temperature
>     >     >     display
>     >     >     and ignores CPUTIN. Which makes sense, since the purpose of
>     PECI is
>     >     to
>     >     >     report
>     >     >     the CPU temperature.
>     >     >
>     >     >     So all you need to do is to ignore the value of CPUTIN and use
>     the
>     >     "PECI
>     >     >     Agent 0"
>     >     >     temperature instead.
>     >     >
>     >     >
>     >     >
>     >     > I am now confused ?
>     >     > I do not know technical details but according to ASUS technical
>     support
>     >     > CPUTIN is temperature of motherboard (not cpu socket , not cpu
>     yourself )
>     >     > what exactly this temperature means ?
>     >     >
>     >     From looking into the OHM source, motherboard temperature is SYSTIN,
>     not
>     >     CPUTIN.
>     >     Some but not all boards have AUXTIN connected as well. CPUTIN does
>     not seem
>     >     to be used at all on ASUS boards as far as I can see.
>     >
>     >
>     >
>     > I am sorry but when I compare my AI Suite monitor (I attached picture) (-
>     60
>     > Celsius)  with psensor ( - 60 Celsius) => CPUTIN correspond with
>     motherboard
>     > temperature and technical support saying the same thing (even if I have
>     to
>     > admit that according to name convention it should be as you said). And
>     AUXTIN
>     > has asus motherboard maximus iv extreme - psensor is showing 33.5 Celsius
>     - no
>     > problem with that.
> 
>     Judging from the OHM source, it looks like some Asus boards have AUXTIN
>     connected,
>     others don't. -60 degrees C suggests that there is nothing connected to the
>     sensor pin.
> 
>     > where did you get exactly those information about what is what ? Could
>     you put
>     > some URL or documentation ?
> 
>     Open Hardware Monitor source code, http://
>     open-hardware-monitor.googlecode.com/svn.
> 
>     I don't see CPUTIN on your screen shot. I only see "CPU" and "CPU socket",
>     but I don't see
>     anything suggesting that those report the temperature as measured on the
>     CPUTIN pin
>     of the NCT6776F. To know how the values reported by the AI suite map to
>     board sensors,
>     it would be necessary to see its source code and/or configuration files.
>    
>     Guenter
> 
> 
> 
>  Oh, sorry , I did not explain it in all context. Minus 60 Celsius has
> motherboard in red colour.
>  On the screenshot there is - 60 celsius temperature which corresponding with
> value as in windows 7 as in linux psensor/lm-sensor as in my bios in under
> certain complicated circumstances :-) That's the one for the reasons why I am
> arguing due to meaning of CPUTIN.
>  I try to explain - it is more complex:
> Minus 60 Celsius does not mean that sensor is not connected. It is connected
> because - In 90 percent of my computer working time it is properly measuring
> value by BIOS and AI Suite ... EXCEPT lm-sensor/psensor in Linux - it is ALWAYS
> minus 60 Celsius - this is wrong.  
>  What I am trying to say is that the problem is definitely at first with
> hardware (this part I am still working on it with asus technical support) and
> at second lm-sensor software in Linux. "Normally" , it is working perfectly
> fine BUT in some very rarely occasions - when computer is running much much
> longer temperature appears as minus 60 Celsius in Windows/BIOS". BUT In Linux -
> it is ALWAYS minus 60 Celsius - it never was different value.
>  Only CPUTIN temperature has such problem in Linux. The other temperatures -
> SYSTIN , AUXTIN , PECI Agent 0 have been always correct as in Windows as in
> BIOS as in Linux. I have been comparing/inspecting those values more than half
> a year so I am sure about those temperature values :-)
> 
>   What I am totally confused is the meaning of CPUTIN/SYSTIN - from my point of
> experience you are first person who is saying that CPUTIN is CPU temperature
> and not motherboard temperature which is opposite what ASUS technical support
> saying and further reason which I have mentioned before.
>   ( :-) So if ASUS technical support is wrong it would be fun to talk with ASUS
> technical support but I have to be absolutely sure about the meaning of CPUTIN
> and SYSTIN :-) )
>   On many forums - owners of this motherboard are confused like me and I did
> not find any reliable source of information to be sure how is it in real ?
> 
> If I run open hardware monitor in linux - there is no values for temperatures -
> except GPU - but only one instead of two and etc. ... too many discrepancies
> within this software on Linux so I do not trust that it is correct measuring
> (need to contact author later)
> 
> AI Suite is commercial ASUS software for measuring many usefull "bios"
> parameters like temperatures/fans/voltages etc. ... but only for windows) - so
> no source code at all - I will try to find some config files.
> By the way - ASUS is not supporting linux at all and will not be - they
> confirmed that.
> 
> Please accept my apology If I explained something bad/wrong way - (I am not
> good in explaination) - let me know for further information.
> 
Well, for my part I don't think I can help you any further. The driver reports
what it gets from the chip. The driver source is public. If you say that the driver
has a bug, feel free to dig through the driver and try to find it. I'll be more
than happy to accept patches.

Thanks,
Guenter

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