> Date: Fri, 23 Mar 2012 01:14:56 -0700
> From: guenter.roeck@ericsson.com
> To: tomasx@hotmail.com
> CC: lm-sensors@lm-sensors.org
> Subject: Re: [lm-sensors] IT8728 shows wrong CPU temperature
>
> On Fri, Mar 23, 2012 at 04:00:35AM -0400, Tomas Johansson wrote:
> > Hi!
> >
> > I have a Gigabyte GA-P67A-UD5-B3 with a IT8728F, yesterday i upgraded to Linux
> > 3.3 and tested the new IT87 module.
> > As i will show below it shows wrong CPU temperature.
> >
> > First:
> >
> > temp1 shows system or motherboard if you want.
> > temp2 shows ?, probably unused
> > temp3 shows CPU but is 7-8 degrees wrong compared to BIOS (I know that temp3 is
> > CPU because it is the only temp value that differ under load)
> >
> >
> > BIOS at this moment in time showed:
> > SYS 34 C
> > CPU 32 C
> >
> >
> > coretemp-isa-0000
> > Adapter: ISA adapter
> > Physical id 0: +36.0 C (high = +80.0 C, crit = +98.0 C)
> > Core 0: +36.0 C (high = +80.0 C, crit = +98.0 C)
> > Core 1: +35.0 C (high = +80.0 C, crit = +98.0 C)
> > Core 2: +33.0 C (high = +80.0 C, crit = +98.0 C)
> > Core 3: +35.0 C (high = +80.0 C, crit = +98.0 C)
> >
> > it8728-isa-0290
> > Adapter: ISA adapter
> > in0: +1.08 V (min = +0.00 V, max = +3.06 V)
> > in1: +2.03 V (min = +0.00 V, max = +3.06 V)
> > in2: +2.96 V (min = +0.00 V, max = +3.06 V)
> > in3: +2.93 V (min = +0.00 V, max = +3.06 V)
> > in4: +0.24 V (min = +0.00 V, max = +0.84 V)
> > in5: +1.20 V (min = +0.00 V, max = +3.06 V)
> > in6: +1.55 V (min = +0.00 V, max = +3.06 V)
> > 3VSB: +3.38 V (min = +0.00 V, max = +6.12 V)
> > Vbat: +3.26 V
> > fan1: 1056 RPM (min = 0 RPM)
> > fan2: 0 RPM (min = 0 RPM)
> > fan3: 0 RPM (min = 0 RPM)
> > fan4: 0 RPM (min = 0 RPM)
> > fan5: 1374 RPM (min = 0 RPM)
> > temp1: +34.0 C (low = +127.0 C, high = +127.0 C) sensor = thermistor
> > temp2: +31.0 C (low = +127.0 C, high = +127.0 C) sensor = thermistor
> > temp3: +25.0 C (low = +127.0 C, high = +127.0 C) sensor = thermistor
> > intrusion0: ALARM
> >
> >
> >
> > Conclusion:
> >
> > fan1, shows correct value.
> > fan5, shows correct value.
> > temp1 (system), shows correct value.
> > temp3 (CPU), shows wrong value, in this case 25 C instead of 32 C.
> >
> I am a bit lost here. Why do you assume that temp2 (which would show roughly
> the correct temperature) is unused, and that temp3 is the CPU temperature ?
> Why not temp2=CPU and temp3=???
>
> What happens if you run something challenging on the system ?
>
> Guenter