lm-sensors and BIOS CPU temp reading is waaay too different

[ticket]

Motherboard: GigaByte? GA K8U-939

with SMSC LPC47M997 chipset (supported by smsc47m192 module since 2.6.18).

$ sensors -v sensors version 2.10.1 with libsensors version 2.10.1

- If I compare the CPU temp in BIOS and with sensors the values are way too different. BIOS: 44 C, sensors: 60 C. The system board temperature seems to be ok.

[ruik]

Hello, for some reason gigabyte has offset of -15C Perhaps also for this board. So you will need to update sensors.conf with following compute line (if CPU temp is temp1)

 compute temp1  (@ -15),  (@ + 15)

(to right section, plus you need to run sensors -s)

Please run some cpu intensive task and and check if the temperatures remain same +-2C as the BIOS one.

Also you may load the K8temp driver and check the core CPU directly. (there is ticket #2140)

With the offset -15 you should get similar temps and also they should not differ too much. If so I will close the ticket and update the wiki.

Thanks,
Rudolf

[ticket]

Thanks.

Added the following:

compute temp2 (@ -15), (@ + 15)

to the section for:

chip "smsc47m192-*"

[ticket]

Everything is ok now. You can close this ticket.

Thanks.

$ sensors

k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:
             +36°C
Core1 Temp:
             +33°C

smsc47m192-i2c-0-2d
Adapter: SMBus ALi 1563 Adapter @ 1400
+2.5V:     +2.56 V  (min =  +0.00 V, max =  +3.32 V)   
VCore:     +1.10 V  (min =  +0.00 V, max =  +2.99 V)   
+3.3V:     +3.28 V  (min =  +0.00 V, max =  +4.38 V)   
+5V:       +5.13 V  (min =  +0.00 V, max =  +6.64 V)   
+12V:     +12.19 V  (min =  +0.00 V, max = +15.94 V)   
VCC:       +3.46 V  (min =  +0.00 V, max =  +4.38 V)   
+1.5V:     +1.66 V  (min =  +0.00 V, max =  +1.99 V)   
+1.8V:     +2.39 V  (min =  +2.39 V, max =  +2.39 V)   ALARM
Chip Temp: +30.0°C  (low  =  -128°C, high =  +127°C)  
CPU Temp:  +36.0°C  (low  =  -143°C, high =  +112°C)  
Sys Temp:  +28.0°C  (low  =    -1°C, high =    -1°C)  
vid:      +1.500 V  (VRM Version 2.4)