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Bug 451869 - CPU core temp reported below ambient
Summary: CPU core temp reported below ambient
Alias: None
Product: Fedora
Classification: Fedora
Component: lm_sensors
Version: 9
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Phil Knirsch
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2008-06-17 21:12 UTC by Matt Castelein
Modified: 2015-03-05 01:20 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2008-06-17 21:17:50 UTC

Attachments (Terms of Use)

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):

How reproducible:

Steps to Reproduce: "sensors"
Actual results:
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.

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