Re: [lm-sensors] VIA Epia ML6000EAG vt1211 CPU temperature wrong value

[Guenter Roeck <guenter.roeck@ericsson.com>]

On Mon, Jun 11, 2012 at 03:55:07AM -0400, kernel@noltedennis.de wrote:
> Hello and thank you for helping.
> 
> The raw readings on following config settings:
> 
> compute temp1 (@ - 83.869) / 0.9528, (@ * 0.9528) +83.869
> 
> # cat /sys/devices/platform/vt1211.24576/temp1_input
> 99000
> # cat /sys/devices/platform/vt1211.24576/temp2_input
> 41000
> 
> for comparison the sensor output:
> #sensors
> ...                                                                       
>  fan1:    0 RPM  (min =    0 RPM, div = 2)
> fan2:          0 RPM  (min =    0 RPM, div = 2)
> temp1:       +15.9 C  (high = +179.6 C, hyst = -88.0 C)
> SIO Temp:    +41.0 C  (high = +204.0 C, hyst =  +0.0 C)
> cpu0_vid:   +1.750 V
> 
temp1 is too low. Just don't have a good idea how to adjust it. Maybe measure
at low and high load and come up with a better approximation.

> 
> without the compute line the hyst value seems to be ok, but the temp is
> pretty high.
> 
> temp1:      +102.0 C  (high = +255.0 C, hyst =  +0.0 C)
> Raw value: 104000
> 
I think I know the problem. hyst is supposed to show report absolute temperature,
not the hysteresis value itself. Looks like displays the hysteresis value itself
(ie the temperature difference/variance) here. The equation is applied to hyst,
which results in the negative value. The raw hysteresis value should be 104000,
just like the raw temperature (assuming no hysteresis is programmed).

> The BIOS of this device does not have an option to check temperature
> directly so i cannot confirm/deny the temp.
> 
Too bad.

> Anything else i can try?
> 
Not much; all you can do is play around with the compute values to get reasonable
temperatures.

I'll get the hysteresis bug fixed.

Guenter

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