[mythtv-users] Fan speed control using lm-sensors doesn't work.Help, please.

[Allen Edwards]

On Wed, Nov 18, 2009 at 7:28 AM, Johnny <jarpublic at gmail.com> wrote:

> > k8temp-pci-00c3
> > Adapter: PCI adapter
> > Core0 Temp:  +51.0C
> > Core0 Temp:  +42.0C
> > Core1 Temp:  +47.0C
> > Core1 Temp:  +35.0C
> > it8716-isa-0e80
> > Adapter: ISA adapter
> > VCore:       +1.31 V  (min =  +0.00 V, max =  +4.08 V)
> > VDDR:        +3.23 V  (min =  +0.00 V, max =  +4.08 V)
> > +3.3V:       +0.00 V  (min =  +0.00 V, max =  +4.08 V)
> > +5V:         +4.87 V  (min =  +0.00 V, max =  +6.85 V)
> > +12V:       +12.10 V  (min =  +0.00 V, max = +16.32 V)
> > in5:         +0.00 V  (min =  +0.00 V, max =  +4.08 V)
> > in6:         +0.00 V  (min =  +0.00 V, max =  +4.08 V)
> > 5VSB:        +6.85 V  (min =  +0.00 V, max =  +6.85 V)
> > VBat:        +3.26 V
> > fan1:       1380 RPM  (min =    0 RPM)
> > fan2:          0 RPM  (min =    0 RPM)
> > fan3:       1849 RPM  (min =    0 RPM)
> > temp1:       +60.0C  (low  =  -1.0C, high = +127.0C)  sensor = thermal
> diode
> > temp2:       +42.0C  (low  =  -1.0C, high = +127.0C)  sensor = transistor
> > temp3:       +25.0C  (low  =  -1.0C, high = +127.0C)  sensor = transistor
> > cpu0_vid:   +1.550 V
>
> <snip>
>
> > What would you change?  Am I reading lm-sensors correctly?
> > Allen
>
> Unfortunately there are a number of issues that can make this
> confusing. First these sensors aren't very accurate. Second the
> lm-sensors software needs to be configured properly for a given
> sensor/chip. It may be off by some constant offset, etc. Third, the
> generic temperature labels make it hard to tell what sensor they go
> with. Your reasoning is right though. The temperatures will be highest
> at the core and go down as you move to the heatsink and case etc. The
> k8temp sensors are the ones on your processor. Usually for each core
> you have a core and a case temperature (CPU casing temp not the PC
> case). The core temp is in the actual core and will be your highest
> temp. The case temp is measure outside the core but in the CPU
> package. So that is why you have two temps for each core.
>
> It is tougher to say what temps the it8716 are referring to. The fact
> that temp1 is higher than your core temperature implies it is not
> calibrated/caculated correctly or it is measuring something else.
> Temp2 looks like it is close to the CPU case temperature. Temp3 looks
> in the right ball park for the motherboard or PC case temp. You can
> get some clarification by using 'watch sensors' and then loading the
> processor with something like cpuburn. Then see how the temperatures
> change under load and see which one line up with the k8temps. When
> most people give their CPU temps that are referring to the CPU case
> temp. So your looks like it is around 40C. So you are fine.
>
Thanks for the post.  Great job explaining it.

Allen
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