Re: RFC: nct6776f support in the w83627ehf and fan RPMsignal de-bounce

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Hi Guenter,

--------- Original Message --------
From: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>
To: Ian Dobson <i.dobson@xxxxxxxxxxxxxx>
Cc: lm-sensors@xxxxxxxxxxxxxx
Subject: Re:  RFC: nct6776f support in the w83627ehf and fan
RPMsignal de-bounce
Date: 03/10/11 12:35

> 
> Hi Ian,
> 
> On Thu, Mar 10, 2011 at 12:20:23AM -0500, Ian Dobson wrote:
> &gt; Hi Guenter,
> &gt; 
> &gt; --------------------------------------------------
> &gt; From: &quot;Guenter Roeck&quot; &lt;guenter.roeck@xxxxxxxxxxxx&gt;
> &gt; Sent: Thursday, March 10, 2011 6:06 AM
> &gt; To: &quot;Robert Kaiser&quot; &lt;kairo@xxxxxxxx&gt;
> &gt; Cc: &lt;lm-sensors@xxxxxxxxxxxxxx&gt;
> &gt; Subject: Re:  RFC: nct6776f support in the w83627ehf and
fan 
> &gt; RPMsignal de-bounce
> &gt; 
> &gt; &gt; Hi again,
> &gt; &gt;
> &gt; &gt; On Wed, Mar 09, 2011 at 10:45:30PM -0500, Guenter Roeck wrote:
> &gt; &gt; [ ... ]
> &gt; &gt;&gt; &gt; fan1:                    0 RPM  (min =    0 RPM, div =
64)
> &gt; &gt;&gt; &gt; fan2:                 1110 RPM  (min =    0 RPM, div =
32)  ALARM
> &gt; &gt;&gt; &gt; fan3:                    0 RPM  (min =    0 RPM, div =
64)
> &gt; &gt;&gt; &gt; fan4:                    0 RPM  (div = 64)
> &gt; &gt;&gt; &gt;
> &gt; &gt; [ ... ]
> &gt; &gt;&gt; Looks reasonable. There is one problem which I had wondered
about - the 
> &gt; &gt;&gt; ALARM
> &gt; &gt;&gt; which tends to show up for running fans.
> &gt; &gt;&gt;
> &gt; &gt;&gt; I finally tracked that down. Turns out the chip has a
&quot;maximum RPM&quot; 
> &gt; &gt;&gt; register.
> &gt; &gt;&gt; Apparently that register is not set, which causes the alarm.
> &gt; &gt;&gt;
> &gt; &gt; Actually, I am not sure if I got that right. Can you set the
minimum speed 
> &gt; &gt; of fan2
> &gt; &gt; to something larger than 1110 rpm and check if that causes ALARM
to go off 
> &gt; &gt; ?
> &gt; &gt;
> &gt; &gt; I suspect I might have misinterpreted the meaning of &quot;Fan
Count Limit&quot;. I 
> &gt; &gt; thought
> &gt; &gt; it is the low limit, but it might well be the high limit.
> &gt; &gt;
> &gt; &gt; Thanks,
> &gt; &gt; Guenter
> &gt; &gt;
> &gt; &gt;
> &gt; &gt; _______________________________________________
> &gt; &gt; lm-sensors mailing list
> &gt; &gt; lm-sensors@xxxxxxxxxxxxxx
> &gt; &gt; http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
> &gt; 
> &gt; Are you sure, on my nct6776f the fan alarming appears to work
correctly:-
> &gt; HD:           532 RPM  (min =  200 RPM)
> &gt; CPU:         1043 RPM  (min =  500 RPM)
> &gt; Case Back:    990 RPM  (min =  500 RPM)
> &gt; Case Front:   765 RPM  (min =  500 RPM)
> &gt; fan5:           0 RPM  (min =    0 RPM)  ALARM
> &gt; 
> &gt; note those are exactly the minimum values I've entered into
sensors3.conf 
> &gt; and when the fan speed drops below these values I see an alarm.
> &gt; 
> Obviously not ;). But there must be a reason for those ALARM responses.
> You point me into the direction, though: Robert's output includes div,
> meaning it looks like he does not have an nct6776f after all.
> 
> So first question is what chip he has.
> 
> Thanks,
> Guenter
> 
> 
> 

Looking at other emails from robert he seems to have a nct6775.

Regards
Ian Dobson


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