Re: Kaveri [and Radeon] temps

Re: Kaveri [and Radeon] temps

[Guenter Roeck]

On Wed, Nov 05, 2014 at 04:15:54PM -0500, James Cloos wrote:
> I'm getting odd temp readings on an A8-7600 with 3.3.4 and Linus'
> current kernel.
> 
> Eg, the gpu temp shows up when (mostly) idle as:
> 
>  radeon-pci-0008
>  Adapter: PCI adapter
>  temp1:         -1.0°C  (crit = +120.0°C, hyst = +90.0°C)
> 
The driver for the Radeon chips is maintained by the radeon driver
maintainers, so you might want to ask at dri-devel@lists.freedesktop.org
(copied with this reply). The driver supports different chips with
different methods to read the temperature, so it might help to know
which chip is in your system (lspci -nn should tell you).

> aka:
> 
>  radeon-pci-0008
>  Adapter: PCI adapter
>  temp1:        +32.0°F  (crit = +248.0°F, hyst = +194.0°F)
> 
> 
> And the cpu temp is similar:
> 
>  k10temp-pci-00c3
>  Adapter: PCI adapter
>  temp1:         +0.0°C  (high = +70.0°C)
>                         (crit = +80.0°C, hyst = +79.0°C)
> aka:
> 
>  k10temp-pci-00c3
>  Adapter: PCI adapter
>  temp1:        +32.0°F  (high = +158.0°F)
>                         (crit = +176.0°F, hyst = +174.2°F)
> 
AMD CPUs are known report wildly off temperatures especially at
low temperatures. Does the temperature increase with load ?

Thanks,
Guenter

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Re: Kaveri [and Radeon] temps

[James Cloos]

>>>>> "GR" == Guenter Roeck <linux@roeck-us.net> writes:

...
GR> AMD CPUs are known report wildly off temperatures especially at
GR> low temperatures.

Thanks.  After some further digging, I wonder whether Aravind's recent
patch might help?  The apu does have both PCI_DEVICE_ID_AMD_16H_M30H_NB_F3
and PCI_DEVICE_ID_AMD_16H_M30H_NB_F4 and lspci reports no driver for the
F4 device.

GR>  Does the temperature increase with load ?

It seems to max out w/in a kelvin or two of the room's ambient temp.

-JimC
-- 
James Cloos <cloos@jhcloos.com>         OpenPGP: 0x997A9F17ED7DAEA6

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Re: Kaveri [and Radeon] temps

[Guenter Roeck]

On Wed, Nov 05, 2014 at 06:34:20PM -0500, James Cloos wrote:
> >>>>> "GR" == Guenter Roeck <linux@roeck-us.net> writes:
> 
> ...
> GR> AMD CPUs are known report wildly off temperatures especially at
> GR> low temperatures.
> 
> Thanks.  After some further digging, I wonder whether Aravind's recent
> patch might help?  The apu does have both PCI_DEVICE_ID_AMD_16H_M30H_NB_F3
> and PCI_DEVICE_ID_AMD_16H_M30H_NB_F4 and lspci reports no driver for the
> F4 device.
> 
Aravind would have to comment; my understanding is that the F4 device
reports the power, not the temperature. You could try to apply the patch
and see if it makes a difference. Worst case there will be no change ;-).

> GR>  Does the temperature increase with load ?
> 
> It seems to max out w/in a kelvin or two of the room's ambient temp.
> 
Even under load ? Sounds weird. Question of course is if the chip really
reports a useful temperature in the first place; this is something I can
not answer, since I have neither a datasheet nor a system with that CPU.

Guenter

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Re: Kaveri [and Radeon] temps

[Aravind Gopalakrishnan]

On 11/5/2014 5:50 PM, Guenter Roeck wrote:
> On Wed, Nov 05, 2014 at 06:34:20PM -0500, James Cloos wrote:
>>>>>>> "GR" == Guenter Roeck <linux@roeck-us.net> writes:
>> ...
>> GR> AMD CPUs are known report wildly off temperatures especially at
>> GR> low temperatures.
>>
>> Thanks.  After some further digging, I wonder whether Aravind's recent
>> patch might help?  The apu does have both PCI_DEVICE_ID_AMD_16H_M30H_NB_F3
>> and PCI_DEVICE_ID_AMD_16H_M30H_NB_F4 and lspci reports no driver for the
>> F4 device.
>>
> Aravind would have to comment; my understanding is that the F4 device
> reports the power, not the temperature. You could try to apply the patch
> and see if it makes a difference. Worst case there will be no change ;-).

Right, F4 is for reporting power values.
The recent patch was a bug fix for fam15h_power, so I don't think that's 
what you are looking for..

>> GR>  Does the temperature increase with load ?
>>
>> It seems to max out w/in a kelvin or two of the room's ambient temp.
>>
> Even under load ? Sounds weird.

Yeah, I have not come across such odd behavior neither. So not able to 
tell you what might be wrong..

> Question of course is if the chip really
> reports a useful temperature in the first place; this is something I can
> not answer, since I have neither a datasheet nor a system with that CPU.

Yes, the values reported are accurate and AFAIK there are folks who are 
interested to look into temperature/power values reported by hwmon, so I 
guess it's useful :)
I shall try and ask around if someone knows anything about incorrect 
values being exposed in the registers and let you know.

Thanks,
-Aravind

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