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Old 09-24-2010, 08:12 AM   #1
Registered: Apr 2010
Location: Cluj, Romania
Distribution: Debian Testing
Posts: 731

Rep: Reputation: 155Reputation: 155
CPU Temperature monitoring question on Athlon II x2 250

So i hava a ASUS M3N78-VM mobo and recently i got a Athlon II 250 CPU tp replace my aging Athlon 3200+. I installed the BIOS update 1407 that includes support for this CPU.
I have Debian Squeeze installed.

I have installed the 2.6.35 kernel from experimental and this has the k10temp module that is made for the k10 series AMD CPUs (Athlon II etc).
But there is also the atk0110 ACPI module that gets sensor readings fom voltages, MB and CPU temps from the motherboard (i think so).

The issue is this: if i run sensors i get this:

# sensors
Adapter: ACPI interface
Vcore Voltage:     +1.07 V  (min =  +0.80 V, max =  +1.80 V)
 +3.3 Voltage:     +3.28 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:       +5.02 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:     +12.09 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:    2335 RPM  (min =  600 RPM)
CHASSIS FAN Speed:   0 RPM  (min =  600 RPM)
POWER FAN Speed:     0 RPM  (min =  600 RPM)
CPU Temperature:   +34.0C  (high = +60.0C, crit = +95.0C)  
MB Temperature:    +36.0C  (high = +45.0C, crit = +95.0C)  

Adapter: PCI adapter
temp1:       +19.2C  (high = +70.0C, crit = +115.5C)
Notice the difference between the 2 module's reported temperature for the CPU (34 C vs 19.2 C).

I rebooted the computer and entered the BIOS - it has shown the values shown by the acpi sensor (it increased rapidly to 38-39 but gone back to 34-35 after i loaded the OS).

Does this mean that the k10temp module reports erroneous temperature or that everybody else (BIOS + ACPI sensor) is wrong and i have an ice cool CPU?
Old 09-24-2010, 08:51 AM   #2
Registered: Aug 2009
Distribution: Debian testing
Posts: 555

Rep: Reputation: 127Reputation: 127
I have the exact problem since I installed linux on my laptop which has an amd k8 3000+.

The bios related module reports a massive 44oC at the moment, while k8temp reports a tiny 12oC.
The k8temp module is not new like the k10temp, but I assume the (mistakes in) calclulations remain the same. Needless to say what I trust.

And on top of it, I have the exact opposite readings on my desktop pc (core 2 duo).
Coretemp reports at least +5oC higher temperatures than the acpi one, in any occasion, plus it gets the temperature... "ups and downs" faster that the acpi one.
So i trust it!


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