autofan.sh

#!/bin/bash

##########################################################################
#
# Script to control (AMD/ATI) fanspeeds depending on the GPUs temperature
#
# Copyright 2011 Markus Niemann (markus@chanoa.de)
#
##########################################################################
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
##########################################################################
#
# Usage: [screen -dmS fan#] autofan.sh {DeviceID}
#
##########################################################################
DEVICE=$1
export DISPLAY=:0.${DEVICE}

# initial fanspeed
FANSPEED=75

# maximum temperature, toggles 100% fanspeed
MAXTEMP=80

# middle temperature, exceeding this temperature will speed up fan
MIDTEMP=78

# minimum temperature, deceeding this temperature will speed down fan
MINTEMP=76

# minimum fanspeed
MINSPEED=60

# percentage fanspeed steps this script will toggle
FANSTEPS=2

# time interval in seconds this script will check temperature
SLEEP=20

if [ $# -ne 1 ]
then
  echo "Usage: `basename $0` {DeviceID}"
  exit $E_BADARGS
fi

function getTemp {
    currenttemp=$(sudo aticonfig --odgt --adapter=$DEVICE | grep C)
    currenttemp=${currenttemp##*- }
    echo ${currenttemp%%.*}
}

function setFanSpeed {
    case $1 in
        up)
            if [ $FANSPEED -lt 100 ]
            then
                FANSPEED=$((FANSPEED+FANSTEPS))
                echo up to $FANSPEED %
                sudo aticonfig --pplib-cmd "set fanspeed 0 $FANSPEED" > /dev/null
            else
                echo Fanspeed already 100%!
            fi
        ;;
        down)
            if [ $FANSPEED -gt $MINSPEED ]
            then
                FANSPEED=$((FANSPEED-FANSTEPS))
                echo down to $FANSPEED %
                sudo aticonfig --pplib-cmd "set fanspeed 0 $FANSPEED" > /dev/null
            else
                echo Fanspeed already low enough!
            fi
        ;;
        *)
            FANSPEED=$1
            echo up to $FANSPEED %
            sudo aticonfig --pplib-cmd "set fanspeed 0 $FANSPEED" > /dev/null
        ;;
    esac
}

setFanSpeed $FANSPEED

while [ 0 == 0 ]
do
    sleep $SLEEP
    TEMP=`getTemp`
    echo Temp is $TEMP
    if [[ $TEMP -ge $MAXTEMP ]]
    then
        setFanSpeed 100
    else
        if [[ $TEMP -ge $MIDTEMP ]]
        then
            setFanSpeed up
        else
            if [[ $TEMP -le $MINTEMP ]]
            then
                setFanSpeed down
            fi
        fi
    fi
done