acpi_termal sysctl interface strange temperature value

[David Demelier]

#define TZ_ZEROC 2732

int val = (t - TZ_ZEROC) / 10;

That should works, I can't remember where I found the TZ_ZEROC value but
someone on IRC gave me it a while ago. I use that for 1 year.



2013/2/26 Kevin Oberman <rkoberman at gmail.com>

> On Sun, Feb 24, 2013 at 11:19 PM, Joerg Wunsch <j at uriah.heep.sax.de>
> wrote:
>
> > As Kevin Oberman wrote:
> >
> > > > Values I'm geting are like this:
> > > > 3732
> > > >
> > > > while actual is:
> > > >
> > > >  sysctl -n hw.acpi.thermal.tz0.temperature
> > > > 55.0C
> > > >
> >
> > > ACPI does not report temperature in degrees Celsius, but in tenths
> > > of a degree Kelvin.  So both agree.
> >
> > I wouldn't call it an agreement if one reports 373 K (= 100 °C),
> > and the other one 55 °C ...
> >
> > (Btw., according to SI, Kelvin is a normal unit of measure, without
> > the "degree".)
> > --
> > cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL
> >
>
> Ack! I should have actually LOOKED at the numbers. Silly mistake. But I
> just looked at the source and ACPI does report temperature in tenths of a
> degree Kelvin, so I am now baffled as to what is going on.
>
> Sorry, but SI or not, "tenths of a Kelvin" is just wrong. Actually, the
> time you should properly omit the 'degrees' is when specifying a
> temperature as in 373 K.
>
> Still, I can't explain the odd reading of the raw value Dimitry is
> getting..
> --
> R. Kevin Oberman, Network Engineer
> E-mail: rkoberman at gmail.com
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-- 
Demelier David