k10temp unreliable CPU thermal sensor; monitoring disabled

I also have a gigabyte board (AM2+ 6 quad series) and an amd phenom (IV) 9850 and I get the same error. R. Franklin (<email address hidden>)

DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic-pae 2.6.35-22.33
Reproducible: Yes

Get the same error on Phenon II X2 550, GA-MA770-ES3 (rev. 1.0) motherboard. Seems to affect Gygabyte...

I just noticed this error when I swapped out my motherboard from a Biostar to a Gigabyte MA785GM-US2H with a Phenom II X4 920. Seems highly related to Gigabyte motherboards.

i have the same issue on an "old" asus m3a32-mvp deluxe series with a phenom processor

i have the same issue on a Phenom 8600B Triple-Core Processor. I'm on 10.10 , kernel is 2.6.35-23-generic

Same issue and this issue prevents me from log-in in "graphical"
System: Kubuntu 64 Maverick
MB: Gigabit
CPU: Phenon 9550

According to http://forums.linuxmint.com/viewtopic.php?f=49&t=58629, it is also happening for non Gigabit Motheboards.

Same issue here, Phenom 9650 X4 2.3GHz in a Gigabyte MA78GM-US2H.
Started after update to Maverick.
Kernel 2.6.35-23-generic #36-Ubuntu SMP.
After the message the system continues booting normally.

getting the same thing at boot, doesn't stop me from getting into x or anything though.

amd phenom 9850 on an asus m2a-vm. i know for a fact that my cpu temperature sensor works correctly. using ubuntu 10.10 x64.

Same issue here, except on a relatively new Asus motherboard. AMD phenom II x4 quad core CPU.
Get the error message and a low graphics boot. After login screen, back to normal and can log into x.

Ubuntu 10.10
Kernel 2.6.35-22-generic.

I get this error too on an HP Pavilion m9400f AMD Phenom X4 9750. I'm not sure what my motherboard is. Since upgrading to 10.10 I spend a lot of time in this bug department. I also get service startup messages splattered on screen in low graphics mode on startup and shutdown, audio noise every 60 seconds.

Having the same problem when upgrading to 10.10.

Motherboard: 1 x ASUS M4N78, NVIDIA nForce 720D MCP, 5200MT/s HT, 4DDR2 / 3PCI / 2PCIe x1 / 1PCIe x16 / 5SATA / 1IDE / 1eSATA, 6USB / GBLAN / HD-Audio, ATX, Socket AM2+
Processor: 1 x AMD Phenom II X4 940 (4x 3.0GHz), 2MB L2 / 6MB L3 Cache, 32/64 bits, Socket AM2+, Boxed

Also i think that my fan is in constant speed now, previously and on lucid lynx fan speed increased on increased cpu load.

I think, This is an AMD cpu specific bug.

This is a AMD specific upstream bug and it will NOT be fixed, since 95% of AMDs thermal sensors give the wrong value.

Same issue here, on a Asus motherboard M3A78-CM and a AMD Phenom X4 9750 Quad Core cpu. I get the error message in a low graphics boot but after this, the logon screen is back to normal and can log into x.

Same issue here with:
AMD Phenom X2 550 BE
Asrock 770De+

Same issue here:

AMD 7750 X2 'Stock 2.7ghz'( DUAL CORE ) ATHLON 64 BIT BLACK EDITION
ASUS M3N78-SE motherboard

I trust this will be fixed regardless as thermal sensors server a purpose otherwise manufactures would not use them. If these sensors provide reliable readings under Windows, which I presume they do otherwise gamers would complain bitterly, then they should be working under Linux.

Comments like "This is a AMD specific upstream bug and it will NOT be fixed, since 95% of AMDs thermal sensors give the wrong value." are unhelpful. If this is the case, then it needs to be fully explained.

Same here.

AMD Phenom(tm) FX-5000 Quad-Core Processor
Asrock A785GXH/128M

On Ubuntu 10.10 64 bit I get the following error message with an AMD Phenom 9600b quad core processor on an Asus M2n68 - AMSE2 motherboard.
"unreliable CPU thermal sensor; monitoring disabled"

I receive no error message using Ubuntu 10.04.1 LTS 64 bit (kernel 2.6.32-27) and the system works great. (Incidentally I also have no problems with the sensors using windows 7)

I hope this will be looked into and I feel comments by Martin Langsholt to be particularly unhelpful....."This is a AMD specific upstream bug and it will NOT be fixed, since 95% of AMDs thermal sensors give the wrong value."

If the sensors worked fine in Ubuntu 10.04.1 but don't work in Ubuntu 10.10 then the matter should be looked into. I'm just wondering if any possible damage could be done to components if this is not fixed?

Same issue after upgrading from an Athlon64

Ubuntu 10.10 64bit
AMD Phenom II X3 715
Biostar MCP6P AM2+ (Nvidia 6150/430)
2.6.35-24-generic

Nothing other than loss of functionality and the "unreliable" message at startup.

Same issue as everyone else. However the problem only started on my machine after installing a Zotac GT 430 Graphics card.
I am using a PE-AM2RS740G2 Motherboard with Phenom x4 9450e Processor.

Looking at this thread it does seem to be an AMD issue. (Has anyone seen this problem with an Intel CPU?). Given that all I did was install a PCIe graphics card it makes me wonder is the AMD thermal sensors are sensitive to power supply noise / poor signal layout on the mother board.

If that is the case then the Thermal Monitoring service should be able to filter the readings to average out the noise.
Is there any app I can use to monitor the temperature sensor?
And if all else fails how do I disable this feature altogether?

Same issue here:

[7.507031] k10temp 0000:10.3 unrealible CPU thermal sensor: monitorin disabled

CPU: AMD Athlon 7750

Ubuntu 10.10

linux-image-2.6.35-22-generic 2.6.35-28.

I found the Code of k10temp:

khali.linux-fr.org/devel/misc/k10temp/k10temp.c

I see the same thing. AMD Phenom 8750, 2.6.38-8-server x86_64, Ubuntu 11.04

Same CPU, 2.6.38-8-generic x86, on Natty.

Supplying "force=1" to the module does suppress the disabling - as in, it loads, and you get a temp out of it.

It might be unreliable, but it seems OK to me.

I suspect it's a little overzealous.

hhlp, thank you for reporting this and helping make Ubuntu better. Maverick reached EOL on April 10, 2012.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We were wondering if this is still an issue in a supported release? If so, can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command in a supported release from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.

Please let us know your results. Thanks in advance.

AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: nashipawa 4752 F.... pulseaudio
 /dev/snd/controlC1: nashipawa 4752 F.... pulseaudio
 /dev/snd/controlC0: nashipawa 4752 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe7f4000 irq 16'
   Mixer name : 'Realtek ALC1200'
   Components : 'HDA:10ec0888,104382fe,00100101'
   Controls : 40
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfe9e8000 irq 19'
   Mixer name : 'ATI RS690/780 HDMI'
   Components : 'HDA:1002791a,00791a00,00100000'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card2.Amixer.info:
 Card hw:2 'HDMI_1'/'HDA ATI HDMI at 0xfeaec000 irq 44'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100000'
   Controls : 6
   Simple ctrls : 1
Card2.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=713624dd-9aef-4ecf-b004-5fe96bdf7c47
IwConfig: Error: [Errno 2] No such file or directory
MachineType: System manufacturer System Product Name
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB:
 0 radeondrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic root=UUID=17ea11e2-6ff6-499e-bfc3-286c9b53467a ro
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-24-generic N/A
 linux-backports-modules-3.2.0-24-generic N/A
 linux-firmware 1.79
RfKill: Error: [Errno 2] No such file or directory
SourcePackage: linux
Tags: precise precise
UdevDb: Error: [Errno 2] No such file or directory
Uname: Linux 3.2.0-24-generic x86_64
UpgradeStatus: Upgraded to precise on 2012-05-01 (0 days ago)
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev sambashare video
dmi.bios.date: 01/24/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M3A-H/HDMI
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2101:bd01/24/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM3A-H/HDMI:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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I have just upgraded to 12.04 and I still have the same issue so I tried

apport-collect -p linux <replace-with-bug-number>

as described above. If I had known that it was going to put so much sensitive system information in the public domain I would never have done it... I'd much rather just provide only the info that is required and on request. That way I can vet it first and obfuscate as required. Too late now...

Just tried with an upstream kernel. The bug still exists:

~$ uname -a
Linux nashiserver 3.4.1-030401-generic #201206041411 SMP Mon Jun 4 18:12:24 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

~$ dmesg | grep unreliable
[ 12.409665] k10temp 0000:00:18.3: unreliable CPU thermal sensor; monitoring disabled

~$ cat /proc/cpuinfo | grep "model name"
model name : AMD Phenom(tm) 8750 Triple-Core Processor
...

I've updated the status to new from incomplete because all the information requested by Christopher in post #26 has been provided.

Paul, if you are having a problem in Ubuntu, please file a new report by executing the following via the Terminal and feel free to subscribe me to it:
ubuntu-bug linux

Thanks!

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

2 years later problem still exist.
Ubuntu 12.04.1 LTS
3.2.0-36-generic
AMD Phenom X4 9950

iSylwester, if you have a bug in Ubuntu, could you please file a new report by executing the following in a terminal:
ubuntu-bug linux

For more on this, please see the Ubuntu Kernel team article:
https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports

the Ubuntu Bug Control team and Ubuntu Bug Squad team article:
https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue

and Ubuntu Community article:
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette

When opening up the new report, please feel free to subscribe me to it.

Please note, not filing a new report may delay your problem being addressed as quickly as possible.

Thank you for your understanding.

Just give up thinking about this bug. I reported it over two years ago.
And I have totally given up waiting for a fix for this one!

On 01/19/2013 02:29 PM, Christopher M. Penalver wrote:
> iSylwester, if you have a bug in Ubuntu, could you please file a new report by executing the following in a terminal:
> ubuntu-bug linux
>
> For more on this, please see the Ubuntu Kernel team article:
> https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
>
> the Ubuntu Bug Control team and Ubuntu Bug Squad team article:
> https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue
>
> and Ubuntu Community article:
> https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
>
> When opening up the new report, please feel free to subscribe me to it.
>
> Please note, not filing a new report may delay your problem being
> addressed as quickly as possible.
>
> Thank you for your understanding.
>

Well , AMD claims that the Temperature is indeed unreliable and SW should not use it, that's why k10temp disables the monitoring.
See http://support.amd.com/us/Processor_TechDocs/41322_10h_Rev_Gd.pdf#74

the easy fix is to do:

Icreate /etc/modprobe.d/k10temp.conf

and just add

# force k10temp module to use the processor temp, even if it's unreliable
options k10temp force=1

and it will work the same as before.