[lm-sensors] [PATCH v5 00/11] hwmon: (w83627ehf) Add support for NCT6775F and NCT6776F

Guenter Roeck guenter.roeck at ericsson.com
Fri Mar 4 20:59:57 CET 2011

On Fri, 2011-03-04 at 13:50 -0500, Andrew Lutomirski wrote:
> On Fri, Mar 4, 2011 at 12:57 PM, Guenter Roeck
> <guenter.roeck at ericsson.com> wrote:
> > The following patch series adds support for NCT6775F and NCT6776F to the
> > w83627ehf driver. It also includes some cleanup and adds support for
> > the fourth temperature sensor on W83677HG-B.
> >
> > No code changes since v4. Resubmitting and widening audience in the hope that
> > someone may find the time to review the changes prior to the next commit window.
> I'm not sure my review is worth much, but the driver seems to work.  I've tested
> fan speed measurement, changing pwm2_enable to 1, changing the fan speed,
> and changing back to 5.  Everything looks good.
> The only weird thing I noticed is that, the first time I ran sensors, I got:
> fan2:                    0 RPM  (min =    0 RPM, div = 64)
> and thereafter I get
> fan2:                  136 RPM  (min =    0 RPM, div = 64)  ALARM
> I suspect (although I haven't checked) that sensors is just reading
> div after it's already changed to 64.
The driver reads rpm, finds it to be zero, and increases div as result
(NCT6775F may report zero rpm if div is too low). That explains the
first reading.

What I don't understand is the alarm you get with the 2nd reading. Any
idea where this might come from ? Is it sticky, or do you see it only
once ?


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