Bug 451869

Summary:	CPU core temp reported below ambient
Product:	[Fedora] Fedora	Reporter:	Matt Castelein <matt.castelein>
Component:	lm_sensors	Assignee:	Phil Knirsch <pknirsch>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	9	CC:	hdegoede, rvokal
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-06-17 21:17:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Matt Castelein 2008-06-17 21:12:15 UTC

Description of problem: The temperature reported for the CPU is below ambient,
and the temperatures for core0 and core1 are wildly different, but they are on
the same die.


Version-Release number of selected component (if applicable):
lm_sensors-3.0.1-5.fc9.x86_64

How reproducible:
always

Steps to Reproduce:
1.run "sensors"
2.
3.
  
Actual results:
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:  +30.0°C
Core1 Temp:  +19.0°C


Expected results:
Useful values

Additional info: CPU is a Dual-Core AMD Opteron 1210

Comment 1 Hans de Goede 2008-06-17 21:17:50 UTC

This is to be expected, the on die temperature diode's of AMD's are wildly
inaccurate (the process in which the silicium is processed from raw silicium to
a processor is not optimised to generate a good temperature sensor but to
generate a good processor).

I can send this report to the author of the k8temp driver if you want, but I
expect the answer to be the same (I'm subscribed to the lm_sensors mailing-list
and this is sort of a FAQ).

Comment 2 Matt Castelein 2008-06-18 00:33:02 UTC

Eh, good enough for me.. I would rather have the good processor.