[ltp] Fan-problem-solution-proposal

[Bob Hutchinson]

On Thursday 05 May 2005 21:29, Florian Dorpmueller wrote:
> For those who like to do something with their fan, I have writen a little
> script. You can use it as deamon or start it as local user (therefore you
> need to change the rights of /proc/acpi/ibm/fan).
>
> On my R51 this script reduces the fan usage remarkable. Under normal
> circumstances (20 degrees centigrade) I notice about 8 minutes fanless
> working and afterwards around 10 minutes cooling.
>
> Try and enjoy,
> Flori
>

Just to confirm that your sweet little script works with a T42.

> #!/bin/sh
> #
> # fan control-script
> #
> # based upon ibm-acpi 0.11
> #
> # eliminates anoying "fan always on" in battery mode
> # works with hysteresis (DELTA) so that always-turn-on/turn-off is avoided
> # fan acivates at MAXTEMP and cools down CPU, GPU etc. to MAXTEMP-DELTA
> than the fan is turned off
> # furthermore detects if AC is on and gives back fan control to default
> behaviour than
> #
> # one can change MAXTEMP and DELTA to individual values
> # but take care of your THINKPAD don`t melt it!
> #
> # have fun!
> # Flori 05.05.05
>
> MAXTEMP=50
> DELTA=4
>
> SWITCHTEMP=$MAXTEMP
>
> while [ 1 ];
> do
>    for ac in `sed s/state:// < /proc/acpi/ac_adapter/AC/state`
>      do
>       if [ "$ac" = "off-line" ]; then
>           fan=no
>           for temp in `sed s/temperatures:// < /proc/acpi/ibm/thermal`
>             do
>               test $temp -gt $SWITCHTEMP && fan=yes
>             done
>
>           if [ "$fan" = "yes" ]; then
>             command='enable'
>             SWITCHTEMP=`expr $MAXTEMP - $DELTA`
>           else
>             SWITCHTEMP=$MAXTEMP
>             command='disable'
>           fi
>
>         else # ac-adapter on -> set fan control to standard behaviour
>           command='enable'
>         fi
>
>         echo $command > /proc/acpi/ibm/fan
>         sleep 15
>       done
>    done

-- 
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Bob Hutchinson
Midwales dot com
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