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yanom

Member

Registered: 2013-06-30

Posts: 36

lm_sensors reports impossibly low temperature for AMD FX-8320 processo

So I ran

# sensors-detect

With all default options (press enter at every prompt). Now when I run

# sensors

It reports for the CPU temperature

k10temp-pci-00c3
Adapter: PCI adapter
temp1:         +9.9°C  (high = +70.0°C)
                       (crit = +90.0°C, hyst = +87.0°C)

This is impossible. It's about 20°C in the room right now, and there are no heat pumps in my computer, so every part should be 20°C or higher. But it's reporting 9.9°C which is clearly wrong. I have an AMD FX-8320 processor installed in an ASUS M5A97 LE motherboard.

Anyone know what's going on here?

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 19,774

Re: lm_sensors reports impossibly low temperature for AMD FX-8320 processo

The second law of thermodynamics is wrong?

But, I am not sure that is the CPU temperature anyway.  I think it might be for a peripheral card -- on the surface, a PCI device. 70C is not nearly high enough for a junction temperature limit.
This may be some sort of i2c sensor that a minimum output of 9.9C -- that value would correspond to a 0x000 from the sensor.  If the sensor were not there, you might read all zeros. Again, just a guess.   

What does acpi -t report?

Last edited by ewaller (2016-09-07 21:34:34)

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R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: lm_sensors reports impossibly low temperature for AMD FX-8320 processo

Some AMD cpus report wrong temperature readings, there is an errata for that and I think there is also a message about that in the output of dmesg. You'll have to check if your cpu might be affected.

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R00KIE
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yanom

Member

Registered: 2013-06-30

Posts: 36

Re: lm_sensors reports impossibly low temperature for AMD FX-8320 processo

What does acpi -t report?

acpi -t gives no output.

Running acpi gives:

No support for device type: power_supply

WFV

Member

From: ☭USSA⛧⭒⭒⭒⭒

Registered: 2013-04-23

Posts: 288

Re: lm_sensors reports impossibly low temperature for AMD FX-8320 processo

Are you running latest bios for the M5A97-LE? maybe the difference in being able to read all the parameters or not... here is example of an FX8350 in an M5A88-M (similar mobo), notice the CPU power shows up as a PCI adapter but I suspect that is where it physically connects on the bus, otherwise you should see similar:

% sensors  
radeon-pci-0100
Adapter: PCI adapter
temp1:        +37.0°C  (crit = +120.0°C, hyst = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:      +0.91 V  (min =  +0.80 V, max =  +1.60 V)
+3.3V Voltage:      +3.34 V  (min =  +2.97 V, max =  +3.63 V)
+5V Voltage:        +5.06 V  (min =  +4.50 V, max =  +5.50 V)
+12V Voltage:      +12.08 V  (min = +10.20 V, max = +13.80 V)
CPU Fan Speed:     1147 RPM  (min =  600 RPM, max = 7200 RPM)
Chassis Fan Speed: 1513 RPM  (min =  600 RPM, max = 7200 RPM)
CPU Temperature:    +34.0°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:     +32.0°C  (high = +45.0°C, crit = +75.0°C)

k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +21.6°C  (high = +70.0°C)
                       (crit = +70.0°C, hyst = +67.0°C)

fam15h_power-pci-00c4
Adapter: PCI adapter
power1:       98.60 W  (crit = 125.19 W)

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mikaelbrun

Member

From: Tistedal/ Norway

Registered: 2016-01-01

Posts: 43

Re: lm_sensors reports impossibly low temperature for AMD FX-8320 processo

I am experiencing some similarities on my system. I thought that the k10temp was the GPU temperature. Am I wrong?
Comparing with the aticonfig -odgt gives big differences, so if the k10temp module isn't the GPU temperature, it would explaine alot.

mich41

Member

Registered: 2012-06-22

Posts: 796

Re: lm_sensors reports impossibly low temperature for AMD FX-8320 processo

Am I wrong?

Yes.

This thing is CPU and it's inaccurate at low temperatures since at least Phenom II.