Re: [lm-sensors] reading on-die temperature sensor of AMD A10 5700 processor

[Guenter Roeck <linux@roeck-us.net>]

On 08/13/2013 10:17 PM, Kapil Dev wrote:
>
> On Aug 14, 2013, at 12:56 AM, Guenter Roeck <linux@roeck-us.net> wrote:
>
>> On 08/13/2013 08:09 PM, Dev, Kapil wrote:
>>>
>>>
>>> On Tue, Aug 13, 2013 at 11:02 PM, Guenter Roeck <linux@roeck-us.net <mailto:linux@roeck-us.net>> wrote:
>>>
>>>     On 08/13/2013 07:41 PM, Dev, Kapil wrote:
>>>
>>>         Thanks again Guenter!
>>>
>>>
>>>
>>>
>>>         On Tue, Aug 13, 2013 at 5:51 PM, Guenter Roeck <linux@roeck-us.net <mailto:linux@roeck-us.net> <mailto:linux@roeck-us.net <mailto:linux@roeck-us.net>>> wrote:
>>>
>>>              On Tue, Aug 13, 2013 at 05:11:31PM -0400, Dev, Kapil wrote:
>>>               > Thanks for the response Guenter!
>>>               >
>>>               > I put the system on load and I noticed their value hardly changes. To my
>>>               > surprise, I ran a benchmark for 3 minutes and none of temp*  values changed
>>>               > during execution. The highest reported temperature is always 48C.
>>>               >
>>>               > I was expecting that the internal temperature would have "sensor = thermal
>>>               > diode" or "sensor = core" as a keyword. I thought "sensor=thermistor" means
>>>               > the corresponding sensor is on the motherboard and not the internal
>>>               > die-sensor.
>>>               >
>>>              Sure, but who knows if they put a sensor below the CPU for some reason ...
>>>
>>>              I am not familiar with the A10 CPUs. Are those similar to K10 ?
>>>              If so, maybe the k10temp driver works or could be extended to support it.
>>>              Can you give it a try ?
>>>
>>>              If it does not work out of the box, can you send me the output of "lspci -nn" ?
>>>
>>>
>>>         Kapil: I believe K10 corresponds to A8 seried, and A10 has Bulldozer architecture (http://www.cpu-world.com/__CPUs/Bulldozer/TYPE-A10-__Series.html <http://www.cpu-world.com/CPUs/Bulldozer/TYPE-A10-Series.html>). I am not sure how different they are though. I tried K10, but it did not work out of the box. I am looking into k10temp.c driver now. Also,I am attaching the output of "lspci -nn" command herewith; you might have to open it using wordpad for proper formatting..
>>>
>>>
>>>     Your lspci output includes
>>>
>>>     00:18.3 Host bridge [0600]: Advanced Micro Devices [AMD] Device [1022:1403]
>>>
>>>     which is supported by the latest k10temp driver. Support was added early last year.
>>>     What is your kernel version, and can you switch to a more recent version ?
>>>
>>>
>>> Kapil: I have 2.6.39-020639-generic kernel. Is it too old kernel for k10temp driver to work? Which stable kernel should I upgrade to?
>>>
>>
>> You need 3.4 or later.
>
> Kapil: I was trying to avoid updating the kernel because my current kernel is setup for running different type of benchmarks etc. Seems like I can't avoid updating the kernel; I will do it..
>
Alternative would be to back-port the k10temp driver from a later kernel. Then you can keep running the old one.

> Just for my understanding: Currently, when I run "sensors" command, I am getting three values (apparently wrong), temp1-3. So, what do you think is happening that is causing these values wrong? And, how is it going to be fixed by updating the  kernel? Although we don't know yet, but, I am hoping that by updating the kernel and loading the k10temp kernel, I would be able to see readings from thermal-diode (core-temperature) along with the current readings from thermal-resistors.
>
Not wrong; those are probably different chassis and/or board temperatures. Does the BIOS report
any matching temperatures ?

Guenter


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