linux-kernel - Re: [PATCH] i8k: Add support for temperature sensor labels

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Date:	Sun, 30 Nov 2014 08:00:18 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Pali Rohár <pali.rohar@...il.com>
CC:	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Steven Honeyman <stevenhoneyman@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i8k: Add support for temperature sensor labels

On 11/30/2014 01:53 AM, Pali Rohár wrote:
[ ... ]
>>>
>>> Original Dell DOS executable ignores all temperature sensors
>>> if type SMM function fails (if I decoded and understand
>>> that DOS assembler code correctly). So maybe we should do
>>> same...
>>>
>>> But because our i8k.c code ignores sensor only if it returns
>>> invalid temperature, there could be possible regression that
>>> on same machines type SMM function is not implemented or
>>> not working...
>>>
>>> What do you think?
>>
>> Tested with XPS13, Studio 1555 (with GPU), and XPS M140.
>> Reading the type works with all of them. The Studio 1555
>> reports the GPU temperature in temp4. The M140 is quite old
>> (about 10 years), so I guess we can be reasonably sure that
>> all laptops currently in use support reporting the type.
>>
>
> Good. Then I will split this patch into two parts. One which adds
> labels and one which change init code to register only those
> sensors which have valid type.
>
Ok.

>> Do you know what is returned for the type if the GPU is turned
>> off on a system with GPU ? I think that is the only open
>> question.
>>
>
> Yes, on my E6440 in both cases when GPU is turned off and on is
> returned same type (GPU). So this does not help us.
>
Unless I misunderstand you, it does help us; it simplifies
sensor detection since we don't have to handle the special case
that the GPU is turned off anymore.

Thanks,
Guenter

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