Fan control scripts
Contents
Fan control shell scripts
sh script example
#!/bin/sh
MAXTEMP=50
while [ 1 ];
do
fan=no
for temp in `sed s/temperatures:// < /proc/acpi/ibm/thermal`
do
test $temp -gt $MAXTEMP && fan=yes
done
command='disable'
test "$fan" = "yes" && command='enable'
echo $command > /proc/acpi/ibm/fan
sleep 20
done
sh script with more features
#!/bin/sh
# fan control-script
#
# based upon ibm-acpi 0.11 (experimental=1 !)
#
# eliminates anoying "fan always on" in battery mode
# works with hysteresis (DELTA) so that always-turn-on/turn-off is avoided
# fan acivates at MAXTEMP and cools down CPU, GPU etc. to MAXTEMP-DELTA than the fan is turned off
# furthermore detects if AC is on and gives back fan control to default behaviour than
#
# one can change MAXTEMP and DELTA to individual values
# but take care of your THINKPAD don`t melt it!
#
# have fun!
# mk 05.05.05
MAXTEMP=51
DELTA=4
SWITCHTEMP=$MAXTEMP
#make sure the script doesn't leave the fan off on error
trap "echo enable > /proc/acpi/ibm/fan" EXIT
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 $command > /proc/acpi/ibm/fan
sleep 15
done
done
sh script with extra safety functionality
ibm_acpi usually works well. But to rely on it completely, this script provides some extra safety functionality:
- It catches various signals and turns the fan on before it quits.
- It turns off the fan under very strict conditions, leaving it on when unexpected errors occur.
#!/bin/sh
# july 2005 Erik Groeneveld, erik@cq2.nl
# It makes sure the fan is on in case of errors
# and only turns it off when all temps are ok.
IBM_ACPI=/proc/acpi/ibm
THERMOMETER=$IBM_ACPI/thermal
FAN=$IBM_ACPI/fan
MAXTRIPPOINT=65
MINTRIPPOINT=60
TRIPPOINT=$MINTRIPPOINT
echo fancontrol: Thermometer: $THERMOMETER, Fan: $FAN
echo fancontrol: Current `cat $THERMOMETER`
echo fancontrol: Controlling temperatures between $MINTRIPPOINT and $MAXTRIPPOINT degrees.
# Make sure the fan is turned on when the script crashes or is killed
trap "echo enable > $FAN; exit 0" HUP KILL INT ABRT STOP QUIT SEGV TERM
while [ 1 ];
do
command=enable
temperatures=`sed s/temperatures:// < $THERMOMETER`
result=
for temp in $temperatures
do
test $temp -le $TRIPPOINT && result=$result.Ok
done
if [ "$result" = ".Ok.Ok.Ok.Ok.Ok.Ok.Ok.Ok" ]; then
command=disable
TRIPPOINT=$MAXTRIPPOINT
else
command=enable
TRIPPOINT=$MINTRIPPOINT
fi
echo $command > $FAN
# Temperature ramps up quickly, so pick this not too large:
sleep 5
done
bash script with fine control over fan speed
While the above scripts only toggle the fan on and off, the following also sets the fan speed according to sytem temperatures. In addition, it includes a hack for preventing the annoying fan pulsing that occurs on some systems.
Prerequisite: the patch for controlling fan speed.
#!/bin/bash
# This script dynamically controls fan speed on some ThinkPad models
# according to user-defined temperature thresholds. It implements its
# own decision algorithm, overriding the ThinkPad embedded
# controller. It also implements a workaround for the fan noise pulse
# experienced every few seconds on some ThinkPads.
#
# The script requires the ibm_acpi patch at
# http://thinkwiki.org/wiki/Patch_for_controlling_fan_speed
#
# WARNING: This script relies on undocumented hardware features and
# overrides nominal hardware behavior. It may thus cause arbitrary
# damage to your laptop or data. Watch your temperatures!
#
# This file is placed in the public domain and may be freely distributed.
LEVELS=( 0 2 4 7) # Fan speed levels
UP_TEMPS=( 52 60 68 ) # Speed increase trip points
DOWN_TEMPS=( 48 56 64 ) # Speed decrease trip points
ANTIPULSE=( 0 1 0 0) # Prevent fan pulsing noise at this level
# (this also prevents fan speed updates)
IBM_ACPI=/proc/acpi/ibm
FAN=$IBM_ACPI/fan
INTERVAL=3
VERBOSE=true
DRY_RUN=false
[[ "$1" == "-t" ]] && { DRY_RUN=true; echo "$0: Dry run, will not change fan state."; }
# Enable the fan in default mode if anything goes wrong:
set -e -E -u
$DRY_RUN || trap "echo enable > $FAN; exit 0" EXIT HUP INT ABRT QUIT SEGV TERM
thermometer() { # output list of temperatures
read X Y < $IBM_ACPI/thermal
[[ "$X" == "temperatures:" ]] || {
echo "$0: Bad temperatures: $X $Y" >&2
exit 1
}
echo "$Y";
}
speedometer() { # output fan speed
cat $FAN | sed '/^speed/!d; s/speed:[ \t]*//'
}
IDX=0
MAX_IDX=$(( ${#LEVELS[@]} - 1 ))
SETTLE=0
while true; do
TEMPS=`thermometer`
$VERBOSE && SPEED=`speedometer`
# Calculate new level
NEWIDX=$IDX
DOWN=$(( IDX > 0 ))
for TEMP in $TEMPS; do
# Increase speed as much as needed
while [[ $NEWIDX -lt $MAX_IDX ]] &&
[[ $TEMP -ge ${UP_TEMPS[$NEWIDX]} ]]; do
(( NEWIDX ++ ))
DOWN=0
done
# Allow decrease (by one index)?
if [[ $DOWN == 1 ]] &&
[[ $TEMP -gt ${DOWN_TEMPS[$(( IDX - 1 ))]} ]]; then
DOWN=0
fi
done
if [[ $DOWN == 1 ]]; then
NEWIDX=$(( IDX - 1 ))
fi
# Transition
OLDLEVEL=${LEVELS[$IDX]}
NEWLEVEL=${LEVELS[$NEWIDX]}
$VERBOSE && echo "tpfan: Temps: $TEMPS Fan: $SPEED Level: $OLDLEVEL->$NEWLEVEL"
$DRY_RUN || echo level $NEWLEVEL > $FAN
sleep $INTERVAL
# If needed, apply anti-pulsing hack after a settle-down period:
if [[ ${ANTIPULSE[${NEWIDX}]} == 1 ]]; then
if [[ $NEWLEVEL == $OLDLEVEL ]]; then
if [[ $SETTLE -ge 0 ]]; then
(( SETTLE -= INTERVAL ))
else
$DRY_RUN || echo level disengaged >> $FAN
sleep 0.5
fi
else
SETTLE=6
fi
fi
IDX=$NEWIDX
done
Init script example
#! /bin/sh
N=/etc/init.d/fan
set -e
case "$1" in
start)
# make sure privileges don't persist across reboots
if [ -d /var/run/fan ] && [ "x`ls /var/run/fan`" != x ]
then
touch -t 198501010000 /var/run/fan/*
fi
fan.sh & # Script from above
;;
stop|reload|restart|force-reload)
killall fan.sh
echo enable > /proc/acpi/ibm/fan
;;
*)
echo "Usage: $N {start|stop|restart|force-reload}" >&2
exit 1
;;
esac
exit 0
Init script example for gentoo
Assume one of the above control scripts is /usr/sbin/ibm-fancontrold, for gentoo use the following init script in /etc/init.d/ibm-fancontrol. Copy the script to /etc/init.d/ibm-fancontrol, then do
# rc-update add ibm-fancontrol default
This will add the init script to the default runlevel.
#!/sbin/runscript
# 2005 Gilbert Tiefengruber
# Distributed under the terms of the GNU General Public License v2
# IBM Fancontrol init script for IBM Thinkpad laptops (tested with R50)
# This init script was written for gentoo 2005.1, kernel 2.6.12
# You need the ibm_acpi kernel module version 0.11 or greater
# load the module with experimental=1 to enable the fan controls
depend() {
need localmount
}
checkconfig() {
if [ ! -e /proc/acpi/ibm/fan ]; then
eerror "The ibm_acpi module must be loaded with (experimental=1)"
return 1
fi
}
start() {
checkconfig || return 1
ebegin "Starting ibm-fancontrold"
start-stop-daemon --quiet -p /var/run/ibm-fancontrold.pid -m -b --start -a /usr/sbin/ibm-fancontrold
eend ${?}
}
stop() {
ebegin "Stopping ibm-fancontrold"
start-stop-daemon --stop --quiet -p /var/run/ibm-fancontrold.pid
eend ${?}
}
fanctrld
fanctrld is a daemon (written in C) that controls the Thinkpad's fan. The basic approach is to monitor both temperature and fan speed. The fan is enabled when a certain temperature is exceeded, and disabled when the BIOS slows down the fan below a certain speed.
