Re: [lm-sensors] MINSTART has no effect in fancontrol

["Hámorszky Balázs" <balihb@gmail.com>]

Jean Delvare wrote:
> Hi Balázs,
> 
> On Sun, 05 Jul 2009 03:09:51 +0200, Hámorszky Balázs wrote:
>> In fancontrol MINSTART has no effect (it has, but only for an INTERVAL 
>> period of time).
>> The line:
>> pwmval="(${tval}-${mint})*(${maxpwm}-${minso})/(${maxt}-${mint})+${minso}"
>> should be:
>> pwmval="(${tval}-${mint})*(${maxpwm}-${minsa})/(${maxt}-${mint})+${minsa}"
>> if I understand the configuration options of fancontrol right.
> 
> I guess you don't. The formula above is perfectly correct. With your
> proposed change, MINSTART would be used instead of MINSTOP for the
> speed computations, which is definitely not what we want.
> 
>> At the current state, pwmval can be lower than MINSTART
> 
> Of course it can, by design. But it can't be lower than MINPWM. I
> suggest you read the fancontrol documentation:
>   http://www.lm-sensors.org/browser/lm-sensors/trunk/doc/fancontrol.txt
> and in particular the graph. You'll see that MINSTART is _not_ used to
> compute the fan speed. MINSTART is only used for the initial pulse to
> get a fan spinning.
> 
>> (so on some temperatures, greater than MINTEMP, the fan won't start).
> 
> It should, if your settings are correct. Maybe you have set either
> MINSTART or MINSTOP too low for your fan.

You're right. My MINSTOP was 0. I've misunderstood the function of it.

> That being said, it could be that the MINSTART pulse of 1 second is a
> tad too short for some fans. If this is your case then you could
> increase the sleep value from 1 to 2 or 3 and see if it helps.
> 

Thanks for the quick help!

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