[lm-sensors] No temperature output with k10temp for AMD II X3 435
clemens at ladisch.de
Mon May 17 09:06:26 CEST 2010
Jean Delvare wrote:
> On Sun, 09 May 2010 22:19:11 +0200, Florian Schwade wrote:
> > [florian at errorkiste ~]$ sensors
> > k10temp-pci-00c3
> > Adapter: PCI adapter
> > temp1: +21.0°C (high = +70.0°C)
> > 21°C is impossible to be the correct temperature. The BIOS reports my
> > CPU running at something like 36°.
The temperature values returned by k10temp are relative; AMD says:
| Tctl is the processor temperature control value, used by the platform to
| control cooling systems. Tctl is a non-physical temperature on an
| arbitrary scale measured in degrees. It does _not_ represent an actual
| physical temperature like die or case temperature. Instead, it specifies
| the processor temperature relative to the point at which the system must
| supply the maximum cooling for the processor's specified maximum case
| temperature and maximum thermal power dissipation.
Apparently, on your CPU, the reported values are about 15 °C lower.
lm-sensors currently does not indicate that values are not absolute.
> Maybe the BIOS applies an arbitrary offset,
AMD doesn't publish any method to derive this offset.
> or they get the temperature from an external sensor connected to a
> hardware monitoring device.
This is usually the case, especially since most mainboards also have
a bunch of other temperature sensors handled by the same hwmon device.
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