Arch Linux

southerncross

Member

Registered: 2010-02-03

Posts: 41

Different temperatures in CPU cores since kernel upgrade

Hi,

The title pretty much says it all. Ever since the upgrade to the kernel 2.6.36 the two cores of my CPU (and Intel i7) have different temperatures. It's almost like the first one does all the work while the other one is inactive:

 [chs@Labarum ~]$ acpi -t
Thermal 0: ok, 52.0 degrees C
Thermal 1: ok, 26.8 degrees C

Any thoughts? Is this bad?

graysky

Wiki Maintainer

From: :wq

Registered: 2008-12-01

Posts: 10,696

Website

Re: Different temperatures in CPU cores since kernel upgrade

Which modules did you load?  I guess my processor isn't supported via acpi:

$ acpi -V
Cooling 0: Processor 0 of 10
Cooling 1: Processor 0 of 10
Cooling 2: Processor 0 of 10
Cooling 3: Processor 0 of 10

What does sensors show?

Example from my X3360:

$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +35.0°C  (high = +76.0°C, crit = +100.0°C)  

coretemp-isa-0001
Adapter: ISA adapter
Core 3:      +34.0°C  (high = +76.0°C, crit = +100.0°C)  

coretemp-isa-0002
Adapter: ISA adapter
Core 1:      +35.0°C  (high = +76.0°C, crit = +100.0°C)  

coretemp-isa-0003
Adapter: ISA adapter
Core 2:      +37.0°C  (high = +76.0°C, crit = +100.0°C)  

it8718-isa-0290
Adapter: ISA adapter
fan1:        610 RPM  (min =    0 RPM)
temp1:       +40.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp2:       +32.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermal diode

Last edited by graysky (2010-12-04 14:14:36)

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TigTex

Member

From: Portugal

Registered: 2008-06-19

Posts: 301

Re: Different temperatures in CPU cores since kernel upgrade

With acpi -t what you are seeing is your CPU (0) and Case (1) temperature. Use "sensors" instead

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.::. TigTex @ Portugal .::.

airstep

Member

Registered: 2008-01-21

Posts: 54

Re: Different temperatures in CPU cores since kernel upgrade

This can make CPU stay hot https://bbs.archlinux.org/viewtopic.php?id=109371. kworker has many wakeups since last kernel update.

Last edited by airstep (2010-12-05 09:22:47)

southerncross

Member

Registered: 2010-02-03

Posts: 41

Re: Different temperatures in CPU cores since kernel upgrade

Thanks for the info. (See output below). I am going to "clean" the laptop a bit, but kworker does not seem to make the CPU run more though, only the temperature is affected.  So I guess I'll wait for the next kernel upgrade...

 [chs@Labarum ~]$ acpi -V
Battery 0: Full, 100%
Battery 0: design capacity 624 mAh, last full capacity 595 mAh = 95%
Adapter 0: on-line
Thermal 0: ok, 53.0 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 85.0 degrees C
Thermal 0: trip point 1 switches to mode passive at temperature 95.0 degrees C
Thermal 0: trip point 2 switches to mode active at temperature 71.0 degrees C
Thermal 0: trip point 3 switches to mode active at temperature 55.0 degrees C
Thermal 1: ok, 26.8 degrees C
Thermal 1: trip point 0 switches to mode critical at temperature 127.0 degrees C
Cooling 0: Fan 0 of 1
Cooling 1: Fan 0 of 1
Cooling 2: LCD 0 of 15
Cooling 3: Processor 0 of 7
Cooling 4: Processor 0 of 7
Cooling 5: Processor 0 of 7
Cooling 6: Processor 0 of 7
Cooling 7: Processor 0 of 7
Cooling 8: Processor 0 of 7
Cooling 9: Processor 0 of 7
Cooling 10: Processor 0 of 7
[chs@Labarum ~]$ acpi -t
Thermal 0: ok, 52.0 degrees C
Thermal 1: ok, 26.8 degrees C
[chs@Labarum ~]$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:       +26.8°C  (crit = +127.0°C)                  
temp2:       +51.0°C  (crit = +85.0°C)                  

radeon-pci-0200
Adapter: PCI adapter
temp1:       +60.0°C                                    

[chs@Labarum ~]$