[lm-sensors] missing fan RPMS

[James]

On 05/13/12 20:48, Guenter Roeck wrote:
> On Sun, May 13, 2012 at 08:08:28PM -0400, James wrote:
> [ ... ]
> 
>>> +3.3V:          +3.33 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
>>> in4:            +1.58 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
>>> in5:            +1.70 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
>>> 3VSB:           +3.46 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
>>> Vbat:           +3.36 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
>>> fan1:          1369 RPM  (min =    0 RPM)  ALARM
>>> fan2:             0 RPM  (min =    0 RPM)  ALARM
>>> fan3:             0 RPM  (min =    0 RPM)  ALARM
>>> fan4:             0 RPM  (min =    0 RPM)  ALARM
>>> fan5:             0 RPM  (min =    0 RPM)  ALARM
>>> SYSTIN:         +36.0 C  (high =  +0.0 C, hyst =  +0.0 C)  ALARM  sensor = thermistor
>>> CPUTIN:         +35.0 C  (high = +80.0 C, hyst = +75.0 C)  sensor = thermistor
>>> AUXTIN:          -2.0 C  (high = +80.0 C, hyst = +75.0 C)  sensor = thermistor
>>> PCH_CHIP_TEMP:   +0.0 C  
>>> PCH_CPU_TEMP:    +0.0 C  
>>> PCH_MCH_TEMP:    +0.0 C  
>>> cpu0_vid:      +0.000 V
>>> intrusion0:    ALARM
>>> intrusion1:    ALARM
>>>
>>> It is labelled 'Chassis fan connector 1" by the motherboard manual.
>>> The other is 'Chassis fan 3'
>>>
>>> The difference is fan1 is 3 pin and fan3 is 4 pin.
>>> I will try moving the 4 pin over so it is only using 3 pins.
>>>
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>>
>> :-(
>> Both fans connected but only one shows up.
>>
> Yes, I think that is exactly the problem. Looks like the board uses a multiplexer
> to connect multiple fans to the same fan sensor input. Which makes it all but impossible
> for third parties (like Linux) to implement working fan control. Really annoying,
> especially since the NCT6776F has really a lot of fan sensor inputs available.
> 
> At least some of the other boards from the same vendor have lots of fan connectors.
> Did you try all of them ?
> 
> Guenter
> 

If they are multiplexed, it is weird I didn't at least get 2 numbers when I was moving them around.
I tried all the plugs on the motherboard.
If I get the information from ASRock about how to read the fan speeds, could I make a config file specific to this motherboard?