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SubjectRe: Hardware running hot and without the fan
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On Thu, 2011-11-03 at 10:25 -0400, Lars Noodén wrote:
> 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
>

Do the fans actually turn, or is the output bogus ?

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).

Thanks,
Guenter


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