k8temp shows wrong temperature

[ticket]

Gigabyte M56S-S3 board AMD X2 BE-2350 CPU Fedora 8

As you can see below the k8temp temperatures are wrong. Sensors.conf is default, version 2.10.5-1.

# sensors
k8temp-pci-00c3
Adapter: PCI adapter
temp1:       -12°C
temp2:       -23°C
temp3:       -21°C
temp4:       -16°C

it8716-isa-0290
Adapter: ISA adapter
VCore:     +0.99 V  (min =  +0.00 V, max =  +4.08 V)
VDDR:      +1.89 V  (min =  +0.00 V, max =  +4.08 V)
+3.3V:     +3.30 V  (min =  +0.00 V, max =  +4.08 V)
+5V:       +4.84 V  (min =  +0.00 V, max =  +6.85 V)
+12V:     +11.97 V  (min =  +0.00 V, max = +16.32 V)
in5:       +3.18 V  (min =  +0.00 V, max =  +4.08 V)
in6:       +0.10 V  (min =  +0.00 V, max =  +4.08 V)
5VSB:      +4.92 V  (min =  +0.00 V, max =  +6.85 V)
VBat:      +3.04 V
fan1:      617 RPM  (min =    0 RPM)
fan2:        0 RPM  (min =    0 RPM)
temp1:       +30°C  (low  =  +127°C, high =  +127°C)   sensor = thermistor
temp2:       +33°C  (low  =  +127°C, high =  +127°C)   sensor = thermistor
temp3:       +22°C  (low  =  +127°C, high =  +127°C)   sensor = diode
vid:      +1.000 V

[ticket]

While this is acknowledged as known problem with 'latest AMD CPUs', at lm-sensors.org 'Devices' page, here is my observation on AMD X2 4200+ I am just testing. The readings are plain wrong, BUT they react to cpu load. My opinion is they are not beyond repair, and maybe the offset value can be obtained either by testing or some other way. Just my $.02...

Thanks, Bob, NJ

root@user-desktop:/home/user# sensors --ver
sensors version 2.10.4 with libsensors version 2.10.4

root@user-desktop:/home/user# sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:
              +1°C
Core0 Temp:
              -3°C
Core1 Temp:
              +2°C
Core1 Temp:
              -3°C

root@user-desktop:/home/user# stress --cpu 8
stress: info: [6883] dispatching hogs: 8 cpu, 0 io, 0 vm, 0 hdd

root@user-desktop:/home/user# sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:
             +19°C
Core0 Temp:
             +18°C
Core1 Temp:
             +21°C
Core1 Temp:
             +20°C


root@user-desktop:/home/user# uname -a
Linux user-desktop 2.6.22-14-generic #1 SMP Thu Jan 31 23:33:13 UTC 2008 x86_64 GNU/Linux

[khali]

This is a known, documented bug in K8 rev. F and later. See erratum #141.

In kernel 2.6.29 there are a few improvements for the rev. F and rev. G K8 CPU, which may help a bit. That's about all we can offer. Fell free to add offsets in sensors.conf, but please keep in mind that reliability of these sensors is known to be bad anyway. In general you're better trusting the external sensors on these systems.