Re: [lm-sensors] Whats wrong with LM-Sensors

[Guenter Roeck <linux@roeck-us.net>]

On 09/08/2013 02:27 PM, Tomas Larsson wrote:
>> -----Original Message-----
>> From: Guenter Roeck [mailto:linux@roeck-us.net]
>> Sent: Sunday, September 08, 2013 11:20 PM
>> To: Tomas Larsson
>> Cc: 'Jean Delvare'; lm-sensors@lm-sensors.org
>> Subject: Re: [lm-sensors] Whats wrong with LM-Sensors
>>
>> On 09/08/2013 01:01 PM, Tomas Larsson wrote:
>>>> -----Original Message-----
>>>> From: Jean Delvare [mailto:khali@linux-fr.org]
>>>> Sent: Sunday, September 08, 2013 9:10 PM
>>>> To: Guenter Roeck
>>>> Cc: Tomas Larsson; lm-sensors@lm-sensors.org
>>>> Subject: Re: [lm-sensors] Whats wrong with LM-Sensors
>>>>
>>>> On Sun, 08 Sep 2013 11:58:39 -0700, Guenter Roeck wrote:
>>>>> Different driver. Centos 6.4 uses the coretemp driver which gets the
>>>>> temperature from the CPU directly. Unfortunately, Centos 6.4 is
>>>>> quite old when it comes to kernel version, and so is its coretemp
> driver.
>>>>> The displayed temperatures in your version are all wrong; the
>>>>> maximum
>>>> temperature for Atom 330 is 125 degrees C, not 90 degrees C.
>>>>> You'll have to add 35 degrees C to the displayed temperature.
>>>>>
>>>>> You could either update the coretemp driver to a later version to
>>>>> fix this, or add the offset to /etc/sensors3.conf.
>>>>>
>>>>> Note that CPU temperatures are notoriously unreliable.
>>>>
>>>> "Inaccurate in the low temperature range" is a better way to describe
>>>> the situation IMHO. The coretemp values are reliably telling the user
>>>> when the temperature gets too close to the high limit.
>>>>
>>>> --
>>>> Jean Delvare
>>>
>>> Well, I'm aware of that, what I want to know is when the fan fails,
>>> these 40mm fans are not that reliable, unfortunately.
>>
>> Not sure if you can use the cpu temperature to predict if the fans are
> working
>> or not. The CPU can get pretty hot under load, even with the fans working.
>>
>> Your initial e-mail showed the fan speeds as 0. Are they broken or turned
> off
>> or not connected to the fan speed sensors ?
>>
>> Guenter
>
> Haven't got a clue why it says that they are 0, they definitely work now
> (changed the fans today),
> They are 3-pins and connected to the correct header.
>

Do you get a non-zero speed reported after replacing the fans ? If the reported
speed is still 0, I am not sure I understand what is going on.

Guenter


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