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 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.

From a board manufacturer perspective, that makes a lot of sense. PECI
provides the temperature from the CPU on-board sensor, making it more reliable
(since it reports the the difference to the maximum temperature) and cheaper
than an external sensor.

To know for sure what is connected to what one would need board schematics.
I would take statements from tech support with a grain (or two) of salt.

Guenter

_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors