[lm-sensors] RFC: nct6776f support in the w83627ehf and fan RPMsignal de-bounce

Guenter Roeck guenter.roeck at ericsson.com
Fri Mar 11 00:38:06 CET 2011

On Thu, Mar 10, 2011 at 06:17:55PM -0500, Robert Kaiser wrote:
> Guenter Roeck schrieb:
> > this is what I configured for my board (Intel DH57JG). Some of it is guessing,
> > some of it is common practice with Winbond/Nuvoton chips.
> I'll look into applying your settings and see how well they work, but 
> I'll first get the BIOS reading tomorrow as Ian suggested.
> > Regarding the temperature sensor labels - those are straight from the chip manual.
> OK, so I have those:
> SYSTIN:                +40.0°C  (high =  +0.0°C, hyst =  +0.0°C)  ALARM 
>   sensor = diode
> I guess this means "System temperature", whatever that means in practice 
> as to where the sensor sits (I've never fully understood that one, even 
> on older systems where it often was called "MB temp" or so).
> CPUTIN:                +39.5°C  (high = +80.0°C, hyst = +75.0°C)  sensor 
> = diode
> That one is probably "CPU temperature" from a CPU sensor in the style as 
> it's existed for ages, even before the cores had their own additional 
> sensors.
That really depends on the board, but, yes, pretty likely.

> SMBUSMASTER 1:         +55.0°C  (high = +80.0°C, hyst = +75.0°C)  sensor 
> = diode
> Hmm, that seems to be an "SMBUS MASTER", wherever that one really sits 
> in practice (fun that it's hotter than the other two).
> Is that some allowed max temp of the CPU (i.e. where it shuts down) or 
> the highest seen temp of the CPU?
> SMBUSMASTER 2:          +0.0°C  (high = +80.0°C, hyst = +75.0°C)
> Not sure what that is, given that it seems to be zero (and I'm sure 
> nothing in my system is at freezing temperature, even if we had that 
> outside a few times in the last week).
> Now those would sound cool, but I guess it's not reporting them.
Agreed. But you might be able to see the DIMM temperatures (if you have DDR3)
by loading the "jc42" module.

Actually, I just had a look at the code again. Turns out there is a bug; you see
the labels associated with NCT6776F, not NCT6775F. Real values should be "PECI Agent 0"
instead of "SMBUSMASTER 1", "PECI Agent 1" instead of "SMBUSMASTER 2",
and "PCH_CHIP_TEMP" instead of "PCH_CHIP_CPU_MAX_TEMP". I'll fix that immediately.
So the temperatures you see as "SMBUSxxx" are really temperatures reported by the CPU.
Just don't ask me why the CPU would report 0 degrees C ;).


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