linux-kernel - Re: Hardware running hot and without the fan

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Message-ID: <4EB7CB54.7020207@gmail.com>
Date:	Mon, 07 Nov 2011 14:13:08 +0200
From:	Lars Noodén <lars.nooden@...il.com>
To:	Henrik Rydberg <rydberg@...omail.se>
CC:	guenter.roeck@...csson.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: Hardware running hot and without the fan

On 11/3/11 7:46 PM, Henrik Rydberg wrote:
[snip]
> I am confused.
> 
> From what I gather, the fans work, and it should be possible to run
> the macfanctld daemon (not fancontrol) to tune the fans.
>
> If there really is a problem with the applesmc, following
> http://ubuntuforums.org/showthread.php?t=924096 is a good idea.
> 
> However, the root problem is most likely the GPU consuming too much
> power. Depending on the exact laptop model, there may or may not be a
> viable workaround. If you model is very new, there is most likely and
> active thread about it on the ubuntu forums.

Not that I could find, at least not useful ones.
Starting a new thread gained no results.

> After checking around on the forums, if you find that this is still a
> fan or temperature sensor problem, and not a GPU problem, then please
> restate the problem as exactly as you can.

Can it be both a fan / sensor / GPU problem?
To restate the symptoms:

- the hardware runs hot in Linux, the same hardware runs cool in OS X
- the fan(s) do not run automatically when the machines get hot
- the fan(s) can be controlled manually
- the temperatures from /usr/bin/sensors on the notebook seem
  suspiciously low

The kernels are

- 3.1.0-999-generic #201111070407 SMP Mon Nov 7
  09:08:05 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

- 3.1.0-2-generic #3-Ubuntu SMP Fri Oct 28
  20:28:07 UTC 2011 i686 i686 i386 GNU/Linux

Output from apport can be found in Launchpad:

 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/881593

The notebook is a MacBookPro8,2 and the desktop is a Macmini3,1

How should I split the problem up and where should I pursue their
resolution?

/Lars
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