From: Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>
To: Guenter Roeck <linux@roeck-us.net>, James Cloos <cloos@jhcloos.com>
Cc: dri-devel@lists.freedesktop.org, lm-sensors@lm-sensors.org
Subject: Re: [lm-sensors] Kaveri [and Radeon] temps
Date: Thu, 06 Nov 2014 15:17:52 +0000 [thread overview]
Message-ID: <545B9120.4080106@amd.com> (raw)
In-Reply-To: <20141105235022.GA26085@roeck-us.net>
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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lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
WARNING: multiple messages have this Message-ID (diff)
From: Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>
To: Guenter Roeck <linux@roeck-us.net>, James Cloos <cloos@jhcloos.com>
Cc: dri-devel@lists.freedesktop.org, lm-sensors@lm-sensors.org
Subject: Re: Kaveri [and Radeon] temps
Date: Thu, 6 Nov 2014 09:17:52 -0600 [thread overview]
Message-ID: <545B9120.4080106@amd.com> (raw)
In-Reply-To: <20141105235022.GA26085@roeck-us.net>
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
_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
next prev parent reply other threads:[~2014-11-06 15:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-05 21:15 [lm-sensors] Kaveri temps James Cloos
2014-11-05 23:21 ` [lm-sensors] Kaveri [and Radeon] temps Guenter Roeck
2014-11-05 23:21 ` Guenter Roeck
2014-11-05 23:34 ` [lm-sensors] " James Cloos
2014-11-05 23:34 ` James Cloos
2014-11-05 23:50 ` [lm-sensors] " Guenter Roeck
2014-11-05 23:50 ` Guenter Roeck
2014-11-06 15:17 ` Aravind Gopalakrishnan [this message]
2014-11-06 15:17 ` Aravind Gopalakrishnan
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