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

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Date:	Fri, 04 Nov 2011 12:27:33 +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:
> On Thu, Nov 03, 2011 at 05:19:25PM +0200, Lars Noodén wrote:
>> On 11/03/2011 05:06 PM, Guenter Roeck wrote:
>>> On Thu, 2011-11-03 at 10:25 -0400, Lars Noodén wrote:
>> [snip]
>>>> The one machine reports one fan and the other two fans.  I haven't found
>>>> a way to set the fan speed manually.  The output from sensors
>>>> is
>>>>  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/881593/comments/44
>>>> and here
>>>>  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/881593/comments/47
>>>
>>> Do the fans actually turn, or is the output bogus ?
>>
>> The output is bogus, the fans are not turning.  On #47 there above, I
>> think the temperatures might be inaccurate, too.  Since they'll go up
>> and down as much as 8 degrees in a few seconds.
>>
>>> You should be able to set the fan speed by writing into the fanX_input
>>> and/or fanX_output sysfs attributes. You find those
>>> in /sys/class/hwmon/hwmon0/device (assuming there is only one hwmon
>>> device).
>>
>> I can set the fan speed manually.  e.g.:
>>
>>  echo 3500 > /sys/class/hwmon/hwmon0/device/fan1_output
>>
>> That helps some.
> 
> 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.

On the note book, one fan works with manual control only.  If there is a
second fan, it cannot be turned on manually.  On the mini, there are no
fan devices listed in /sys/class/hwmon/hwmon0/device/

> 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've been able to find and an attempt at starting a new thread
has no response.

> 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.

I think there are two problems.  One is the GPU or some other part
running hot.  The other is the sensors/fans issue: the fans don't turn
on even when the system is hot.  Both problems are evident on two
different models of hardware, the notebook is a MacBookPro8,2 and the
desktop is a Macmini3,1.

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

/Lars
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