Talk:Fan control scripts
Wyrfel, are you sure the recent (19:54, 27 Oct 2005) cosmetic change was a good idea? The extensive chunks of code make it hard to grok the structure of the article in the absense of separator lines (which "===" doesn't have). --Thinker 22:10, 27 Oct 2005 (CEST)
We can discuss this. From my point of view, the chunks of code distinguish themselves from each other quite well, because they are each in one code block.
I do not like the = section level - and so far we avoided them on all pages - because
- it generates H1 headings, which is the same as the page heading,
- having more than one level with the hbars is confusing/less readable, because they are not very well distinguishable. This way i.e. the "Other" section looked like a separate empty secion.
I think the way it's now, the separator lines make it possible to easily distinguish the different main sections, while when you have both levels with separator lines, an additional task of distinguishing H1 and H2 separators is necessary.
However, i see your point as well and would like to hear more opinions/arguments.
Wyrfel 22:31, 27 Oct 2005 (CEST)
bash script with fine control over fan speed (for unpatched kernels)
Moved to the article page, after joint development by Spiney and Thinker.
Note that the fan levels, thresholds and anti-pulsing hacks are system-specific, so you may need to adjust them.
I think it'd probably be nice to have a table of the suggested values here. Those in the "unpatched kernels" script seems to work fine on my R52, but the other scripts all have different values.
--Micampe 08:19, 12 Nov 2005 (CET)
Sensor-specific variable-speed script
Here's a new variable-speed control script that lets you define the temperature range separately for each sensor. To keep things simple, it auto-computes the trip points (unlike the current script). Works well on a T43, and (just barely) keeps the fan off most of the time with CPU undervolting and Template:Fglrx set to maximum power saving. Feedback on other machines would be appreciated.
Any idea what the funny sensors (2nd and 3rd) are? On the T43, the second sensor seems to be the same as the HDAPS sensor (it never deviates by more than one degree from what the HDAPS sensor tells directly), but I don't know where it's located. The 3rd sensor is uncorrelated with disk temperature and activity.
#!/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.
#
# 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
ANTIPULSE=( 0 1 0 0) # Prevent fan pulsing noise at this level
# (this also prevents fan speed updates)
# Temperature ranges, per sensor:
MIN_TEMPS=( 52 49 44 51 39 45 35 45 49 ) # step up from zero-th fan level at this temperature
MAX_TEMPS=( 70 59 54 68 52 55 45 55 59 ) # step up to maximum fan at this temperature
# CPU HDAPS ??? GPU BAT-SW n/a BAT-NE n/a HDAPS (ThinkPad T43)
# CPU m-PCI HDD GPU BAT-SW n/a BAT-NE n/a HDAPS (ThinkPad R51)
IBM_ACPI=/proc/acpi/ibm
HDAPS_TEMP=/sys/bus/platform/drivers/hdaps/hdaps/temp1
PID_FILE=/var/run/tp-fancontrol.pid
INTERVAL=3
VERBOSE=true
DRY_RUN=false
DAEMONIZE=false
AM_DAEMON=false
KILL_DAEMON=false
SYSLOG=false
LOGGER=/usr/bin/logger
usage() {
echo "Usage: $0 [OPTION]..."
echo
echo "Available options:"
echo " -t test mode"
echo " -q quiet mode"
echo " -d daemon mode, go into background (implies -q)"
echo " -l log to syslog"
echo " -p pid file location for daemon mode, default: $PID_FILE"
echo " -k kill daemon (ignores all but -p)"
exit 1
}
while getopts 'qtdlp:kh' OPT; do
case "$OPT" in
t) # test mode
DRY_RUN=true
;;
q) # quiet mode
VERBOSE=false
;;
d) # go into background and daemonize
DAEMONIZE=true
;;
l) # log to syslog
SYSLOG=true
;;
p) # different pidfile
PID_FILE="$OPTARG"
;;
k) # kill daemon
KILL_DAEMON=true
;;
h) # short help
usage
;;
\?) # error
usage
;;
esac
done
[ $OPTIND -gt $# ] || usage # no non-option args
# no logger found, no syslog capabilities
$SYSLOG && [ ! -x $LOGGER ] && SYSLOG=false
if $DRY_RUN; then
echo "$0: Dry run, will not change fan state."
VERBOSE=true
DAEMONIZE=false
fi
thermometer() { # output list of temperatures
read X Y < $IBM_ACPI/thermal
if ! [ "$X" == "temperatures:" ]; then
echo "$0: Bad temperatures: $X $Y" >&2
exit 1
fi
echo -n "$Y ";
[ -r $HDAPS_TEMP ] && echo -n "`cat $HDAPS_TEMP` "
return 0
}
speedometer() { # output fan speed RPM
sed -n 's/^speed:[ \t]*//p' $IBM_ACPI/fan
}
setlevel() { # set fan speed level
$DRY_RUN || echo 0x2F $1 > $IBM_ACPI/ecdump
}
cleanup() { # clean up after work
$AM_DAEMON && rm -f $PID_FILE 2> /dev/null
$SYSLOG && $LOGGER -t "`basename $0`[$$]" \
"Shutting down, switching to automatic fan control"
$DRY_RUN || echo enable > $IBM_ACPI/fan
}
floor_div() {
echo $(( (($1)+1000*($2))/($2) - 1000 ))
}
control_fan() {
# Enable the fan in default mode if anything goes wrong:
set -e -E -u
trap "cleanup; exit 2" HUP INT ABRT QUIT SEGV TERM
trap "cleanup" EXIT
IDX=0
MAX_IDX=$(( ${#LEVELS[@]} - 1 ))
SETTLE=0
FIRST=true
$SYSLOG && $LOGGER -t "`basename $0`[$$]" "Starting dynamic fan control"
# Control loop:
while true; do
TEMPS=`thermometer`
$VERBOSE && SPEED=`speedometer`
# Calculate new level index by placing temperatures into Z-regions:
# Z >= 2*I means "must be at index I or higher"
# Z = 2*I+1 is hysteresis: "don't step down if currently at I+1"
# hence the Z-regions are, for d=(MAX-MIN)/(2*MAX_IDX-1) :
# Z=0:{-infty..MIN-d) Z=1:{MIN-d..MIN) Z=2:{MIN..MIN+d} Z=3:{MIN+d..MIN+2d} ... Z=2*MAX_IDX:{MAX-d, MAX}
MAX_Z=$(( IDX>0 ? 2*(IDX-1) : 0 ))
SENSOR=0
Z_LIST=''
for TEMP in $TEMPS; do
[ $SENSOR -lt ${#MIN_TEMPS[@]} -a $SENSOR -lt ${#MAX_TEMPS[@]} ] ||
{ echo "Too many sensors, not enough values in MIN_TEMPS and MAX_TEMPS" 2>&1; exit 1; }
MIN=${MIN_TEMPS[$SENSOR]}; MAX=${MAX_TEMPS[$SENSOR]}
Z=$(( `floor_div $(( (TEMP-MIN)*(2*MAX_IDX-2) )) $((MAX-MIN))` + 2 ))
Z_LIST="$Z_LIST $Z"
[ $MAX_Z -gt $Z ] || MAX_Z=$Z
(( ++SENSOR ))
done
[ $SENSOR -gt 0 ] || { echo "No temperatures read" >&2; exit 1; }
(( (MAX_Z == 2*IDX-1) && ++MAX_Z )) # hysteresis
NEW_IDX=$(( MAX_Z/2 ))
[ $NEW_IDX -le $MAX_IDX ] || NEW_IDX=$MAX_IDX
# Transition
$FIRST && OLDLEVEL=unknown || OLDLEVEL=${LEVELS[$IDX]}
NEWLEVEL=${LEVELS[$NEW_IDX]}
$VERBOSE && echo "Level: $OLDLEVEL->$NEWLEVEL Fan: $SPEED Temps: $TEMPS" #" Z:$Z_LIST"
$SYSLOG && [ $OLDLEVEL != $NEWLEVEL ] &&
$LOGGER -t "`basename $0`[$$]" "Changing fan level: $OLDLEVEL->$NEWLEVEL"
setlevel $NEWLEVEL
sleep $INTERVAL
# If needed, apply anti-pulsing hack after a settle-down period:
if [ ${ANTIPULSE[${NEW_IDX}]} == 1 ]; then
if [ $NEWLEVEL == $OLDLEVEL ]; then
if [ $SETTLE -ge 0 ]; then
(( SETTLE -= INTERVAL ))
else
setlevel 0x40 # disengaged
sleep 0.5
fi
else
SETTLE=6
fi
fi
IDX=$NEW_IDX
FIRST=false
done
}
if $KILL_DAEMON ; then
if [ -f $PID_FILE ]; then
set -e
DPID="`cat $PID_FILE`"
kill "$DPID"
rm "$PID_FILE"
$VERBOSE && echo "Killed process $DPID"
else
$VERBOSE && echo "Daemon not running."
exit 1
fi
elif $DAEMONIZE ; then
if [ -e "$PID_FILE" ]; then
echo "$0: File $PID_FILE already exists, refusing to run."
exit 1
else
AM_DAEMON=true VERBOSE=false control_fan 0<&- 1>&- 2>&- &
echo $! > "$PID_FILE"
exit 0
fi
else
[ -e "$PID_FILE" ] && echo "WARNING: daemon already running"
control_fan
fi
