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

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Message-ID: <4EB2A46B.8080600@gmail.com>
Date:	Thu, 03 Nov 2011 16:25:47 +0200
From:	Lars Noodén <lars.nooden@...il.com>
To:	Guenter Roeck <guenter.roeck@...csson.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	Henrik Rydberg <rydberg@...omail.se>
Subject: Re: Hardware running hot and without the fan

On 11/03/2011 03:49 PM, Guenter Roeck wrote:
> On Thu, Nov 03, 2011 at 04:29:49AM -0400, Lars Noodén wrote:
>> On 11/03/2011 04:03 AM, Guenter Roeck wrote:
>>> From LKML:
>>>
>>> On Wed, Nov 02, 2011 at 05:42:39AM -0400, Lars Noodén wrote:
>>>> There seem to be two problems here, one is that the hardware is 
>>>> getting WAY too hot, another is that the fan is not turning on when
>>>> the hardware gets too hot.
>>>>
>>>> $ uname -a Linux xubuntu 3.1.0-999-generic #201110270406 SMP Thu 
>>>> Oct 27 08:07:41 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
>>>>
>>>> I've reported the problem to Ubuntu 
>>>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/881593 and the
>>>> suggestion there was to report it upstream.
>>>>
>>>> On the notebook computer, parts become very hot to the touch while 
>>>> running Ubuntu, but the fan does not run even after it gets hot. 
>>>> When I boot back to OS X, the fan kicks in and runs until the 
>>>> computer returns to being cool to the touch.  Similar for the 
>>>> desktop, though I must follow the temperature with 
>>>> /usr/bin/sensors.
>>>>
>>>> The notebook is a MacBookPro8,2 and the desktop is a Macmini3,1
>>>>
>>>> What metrics do I need to collect to help fix the problem?  I've 
>>>> already reported the problem to Ubuntu[2] and the recommendation 
>>>> was to try reporting upstream.
>>>>
>>>> Please CC me in the replies. /Lars
>>>>
>>>> [1] http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/
>>>>
>>>> [2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/881593
>>>
>>> I see applesmc: : read arg fail in the dmesg log. No idea what that 
>>> means. Maybe the driver maintainer or someone else on the lm-sensors
>>>  mailing list can help.
>>>
>>> Not sure I understand your comment about having to follow the output
>>>  of the sensors command. Can you clarify ?
>>
>> That's to track the temperature manually.
>>
>>> Also, do you get any output from the sensors command on the notebook?
>>> Thanks, Guenter
>>
>> Yes.  It claims to have 24 temperature sensors.
>>
> Does it report any fans ? If it does, can you try setting the fan speed ?

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

/Lars
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