Lm_sensors making little sense...

Hi All,

I'm setting up Lm_sensors on my new Arch Linux system. Everything 
appears to be working, however I'm getting out values that bear no 
relation to those reported by the BIOS. The output of the sensors 
command is:

k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +17.6°C  (high = +70.0°C)
                        (crit = +70.0°C, hyst = +69.0°C)

it8720-isa-0228
Adapter: ISA adapter
in0:          +1.02 V  (min =  +0.00 V, max =  +4.08 V)
in1:          +1.50 V  (min =  +0.00 V, max =  +4.08 V)
in2:          +3.36 V  (min =  +0.00 V, max =  +4.08 V)
+5V:          +3.07 V  (min =  +0.00 V, max =  +4.08 V)
in4:          +3.06 V  (min =  +0.00 V, max =  +4.08 V)
in5:          +2.16 V  (min =  +0.00 V, max =  +4.08 V)
in6:          +2.16 V  (min =  +0.00 V, max =  +4.08 V)
5VSB:         +3.02 V  (min =  +0.00 V, max =  +4.08 V)
Vbat:         +3.15 V
fan1:         949 RPM  (min =   10 RPM)
fan2:        1541 RPM  (min =   10 RPM)
fan3:           0 RPM  (min =    0 RPM)
temp1:        +41.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = 
thermistor
temp2:        +79.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = 
thermistor
temp3:        +17.0°C  (low  = +127.0°C, high = +70.0°C)  sensor = 
thermistor

This is with all three cores on my CPU idling (<2% usage) and the 
frequency being automatically scaled back to 800MHz. A quick reboot to 
the BIOS reveals the real values to be:

System temperature: 40°C
CPU Temperature: 28°C
CPU Fan: ~1566RPM
System Fan: ~1548RPM

It looks like one of the fan readings is pretty much correct and 
perhaps temp1 relates to the system temp. Nothing else makes much sense 
though and temp2 is very weird. According to <insert search engine here> 
lm_sensors can be configured to convert the raw values differently with 
expression lines in it's configuration file. However, the only part 
which seems to relate to my detected hardware is:

chip "it87-*" "it8712-*" "it8716-*" "it8718-*" "it8720-*"

     label in8 "Vbat"

...and even if I found the correct part I would have no idea what the 
correct conversion expressions would be.

Does anyone have any tips for configuring this for a specific 
motherboard? The motherboard in question is a Gigabyte A75M-D2H.

Thanks in advance,

Rob Connolly



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