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    SubjectRe: [lm-sensors] Hardware running hot and without the fan
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    On 11/3/11, Guenter Roeck <guenter.roeck@ericsson.com> wrote:
    > On Thu, 2011-11-03 at 12:43 -0400, Jean Delvare wrote:
    >> 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.
    >>
    > Yes, you are right - it won't work without patching it to use
    > fanX_output and to accept larger values for the limits.
    >
    > Wonder how this works for other Apple systems. Maybe there is an
    > Apple-specific script out there to control fan speed.
    >
    >> > 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 :(
    >>
    > Here is some info from the web about the problem. See
    > http://ubuntuforums.org/archive/index.php/t-981280.html.
    >
    > So, for those that have reported high temperatures due to low fan
    > speeds: check the value of
    >
    > cat /sys/devices/platform/applesmc.768/fan1_manual

    It is zero already:
    $ cat /sys/devices/platform/applesmc.768/fan1_manual
    0

    /Lars

    > With no software control of the fans, which is the case with the
    > macbooks (fancontrol and pwmconfig does not work), the fan speed seems
    > to be controlled automatically by the SMC without issues - but only if
    > fan1_manual is zero.
    >
    > Guenter
    >
    >
    >
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