linux-kernel - Re: [lm-sensors] Hardware running hot and without the fan

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Date:	Thu, 3 Nov 2011 17:43:21 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	guenter.roeck@...csson.com
Cc:	Lars Noodén <lars.nooden@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [lm-sensors] Hardware running hot and without the fan

On Thu, 3 Nov 2011 08:32:02 -0700, Guenter Roeck wrote:
> On Thu, 2011-11-03 at 11:19 -0400, Lars Noodén wrote:
> > I can set the fan speed manually.  e.g.:
> > 
> >  echo 3500 > /sys/class/hwmon/hwmon0/device/fan1_output
> > 
> > That helps some.
> > 
> If you can do that, you should be able to set up fancontrol to
> automatically control fan speed based on system temperatures.

This won't work, as fancontrol wants pwmX attributes which the applesmc
driver doesn't implement.

> There is another sysfs attribute - fanX_manual. I don't find driver
> documentation, so I have no idea what it is doing. The name indicates
> that it might set manual vs. automatic fan control. What is it set to in
> your system ? From the code, looks like it should be 0 or 1. Try to
> toggle it and see what happens - after all, it can not get worse ;).

Might be worth looking at files fanX_min, _max and _safe too. Too bad
there doesn't seem to be any documentation available for all these
non-standard attributes :(

-- 
Jean Delvare
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