negative M/B (sys) temperature

Message

djscribble · Post by **djscribble** » Thu Aug 16, 2007 4:13 pm

Greetings,

I got all of my lm_sensors configuration setup and now sensors is reporting fairly accurately for everything EXCEPT my Motherboard (which is reporting as sys temp)

Here is what it looks like:

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Sys Temp:    -65 C  (high =    +0 C, hyst =  +127 C)

How is it possible for the temperature to be negative by that much?? and how can i fix it?

Here are the sensors that are being used:

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 * Loading lm_sensors modules...
 *   Loading i2c-nforce2 ...                                                                                      [ ok ]
 *   Loading lm78 ...                                                                                             [ ok ]
 *   Loading w83627ehf ...                                                                                        [ ok ]
 *   Loading coretemp ...                                                                                         [ ok ]
 * Initializing sensors ...                                                                                       [ ok ]

I am using kernel 2.6.22-gentoo-r2 with lm_sensors 2.10.4
I had the same behavior with LM_Sensors 2.10.2 in RE: to the negative temp

thanks!
Adam

eccerr0r · Post by **eccerr0r** » Thu Aug 16, 2007 4:44 pm

huge negative temperature could mean either the correction factor in /etc/sensors.conf is wrong, or the motherboard is missing the sensor. Is the temperature in BIOS correct?

djscribble · Post by **djscribble** » Thu Aug 16, 2007 5:08 pm

Great! I was hoping it was only a conversion factor problem

and yes, the bios is reporting the temperature correctly.

I have taken a brief look at the sensors.conf (which is still pretty vanilla) however, i was unsure what to do to setup a conversion factor. I did see the compute temp lines, but i am unsure on the syntax.

i believe the syntax would be something like:

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compute sys @ [mathematical functions]

is this the correct syntax (also, the @ symbol would represent the currently reported number?)

any help is appreciated.

thanks!

frenkel · Post by **frenkel** » Thu Aug 16, 2007 6:11 pm

man sensors.conf

.....

djscribble · Post by **djscribble** » Thu Aug 16, 2007 7:19 pm

i got it working now -- i mistyped when i was looking in the man page before...

thanks again!

djscribble · Post by **djscribble** » Fri Aug 17, 2007 4:31 am

OK, so i turned off my computer and when i turned it back on, i checked my BIOS - M/B temp is 31 C

I run sensors after boot, it is -65 -- so apparently it was just a lucky fluke that once my box heats up it is the absolute value of what is being reported...

I did notice the following:

alarms: Board temperature input (LM75) ALARM

I have LM75 loaded, however it is still not reading...

Here is my sensors output:

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sensors
lm78-i2c-1-28
Adapter: SMBus nForce2 adapter at f000
VCore 1:   +2.59 V  (min =  +0.00 V, max =  +3.49 V)   
VCore 2:   +3.39 V  (min =  +1.31 V, max =  +3.20 V)   ALARM
+3.3V:     +3.26 V  (min =  +1.60 V, max =  +1.14 V)   ALARM
+5V:       +5.48 V  (min =  +5.11 V, max =  +5.83 V)   
+12V:      +9.06 V  (min =  +4.62 V, max = +12.65 V)   
-12V:     -11.01 V  (min =  -4.90 V, max =  -3.95 V)   ALARM
-5V:       -5.49 V  (min =  -1.97 V, max =  -5.49 V)   ALARM
fan1:        0 RPM  (min = 168750 RPM, div = 8)          ALARM
fan2:     1328 RPM  (min = 1962 RPM, div = 8)          ALARM
fan3:     4787 RPM  (min = 42187 RPM, div = 2)          ALARM
M/B Temp:  -65.0 C  (high =    +0 C, hyst =  +127 C)   ALARM
vid:       +3.00 V
alarms:   Board temperature input (LM75)               ALARM
alarms:   Chassis intrusion detection                  ALARM

w83627dhg-isa-0290
Adapter: ISA adapter
VCore:     +1.30 V  (min =  +0.00 V, max =  +1.74 V) 
in1:      +11.19 V  (min =  +4.33 V, max = +10.56 V) ALARM
AVCC:      +3.26 V  (min =  +1.60 V, max =  +1.14 V) ALARM
3VCC:      +3.26 V  (min =  +3.04 V, max =  +3.47 V) 
in4:       +1.19 V  (min =  +0.61 V, max =  +1.66 V) 
in5:       +1.58 V  (min =  +0.57 V, max =  +0.70 V) ALARM
in6:       +5.84 V  (min =  +5.84 V, max =  +2.10 V) ALARM
VSB:       +3.26 V  (min =  +2.13 V, max =  +0.80 V) ALARM
VBAT:      +3.18 V  (min =  +2.69 V, max =  +1.54 V) ALARM
Case Fan:    0 RPM  (min = 10546 RPM, div = 128) ALARM
CPU Fan:  1328 RPM  (min = 1962 RPM, div = 8) ALARM
Aux Fan:  2393 RPM  (min = 21093 RPM, div = 4) ALARM
fan4:     2376 RPM  (min = 1035 RPM, div = 8)
fan5:        0 RPM  (min = 10546 RPM, div = 128) ALARM
Sys Temp:    -65 C  (high =    +0 C, hyst =  +127 C)  
CPU Temp:  +44.0 C  (high = +127.0 C, hyst =  +0.0 C)   ALARM
AUX Temp:  +47.0 C  (high = +127.0 C, hyst =  +0.0 C)  

coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +47 C  (high =   +85 C)                   

coretemp-isa-0001
Adapter: ISA adapter
Core 1:      +48 C  (high =   +85 C)

any thoughts on what i might be able to do to get the LM75 portion to start reporting the temperature?? (please disregard the alarms unless you see something quite alarming in the reported column and not the min/max values)

thanks again