No fan values with W83637HF

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"Jean Delvare" <khali at linux-fr.org> tapota :

> Hi Mathieu,
>
>> The mail subject is the (light) issue I have with W83637HF
>> sensors. Everything seems to be running fine but I have no value for
>> the fans. The fans (box and CPU) are correctly identified in the BIOS.
>> (...)
>> fan1:        0 RPM  (min = 3461 RPM, div = 2)
>> CPU Fan:     0 RPM  (min = 168750 RPM, div = 2)
>> fan3:        0 RPM  (min = 6250 RPM, div = 8)
>
> This is a FAQ. Most probably, all you need to do is increase the dividers
> for fans 1 and 2 (fan 3 is probably not connected).
>
> http://www2.lm-sensors.nu/~lm78/cvs/lm_sensors2/doc/lm_sensors-FAQ.html#Section-4_002e1
>
>> Any clues ? On another computer, with different hardware but working
>> with lm-sensors (it87), I notice that fan speed is shown only when it
>> reach some value; and I read stuff related to that in the docs.
>
> It's again a problem with dividers being too low. The slower a fan is,
> the higher the divider needs to be for a hardware monitoring chip to
> properly measure its speed. Double dividers and it should be fine.

Hello Jean,

While (shame on me) I did not read the FAQ, I found on the web clues
about this divider problem. I already tried to change the factor within
gkrellm before sending the mail. Now I realize that changing the
factor in gkrellm is probably not comparable to modifying the divider. 

So I've just did changed the fanx_div in /etc/sensors, run sensors -v
.. And now it seems to be working (somehow surprising results, though
- no real speed increase/decrease whatever the CPU temperature ; but
it could be explained by the BIOS configuration where 55? is the
target temperature, a temperature the CPU hardly reach since the room
the computer is within is a bit cold). 

Sorry for the noise,
Regards,


-- 
Mathieu Roy

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