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

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Message-ID: <20111103134902.GA26121@ericsson.com>
Date:	Thu, 3 Nov 2011 06:49:02 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Lars Noodén <lars.nooden@...il.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 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 ?

Thanks,
Guenter

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