Difference between revisions of "Talk:Patch for controlling fan speed"

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==Using sudo==
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Any idea why I have to use '''sudo -s''' first instead of just using '''sudo <command>'''?
 +
 +
* Just using {{cmduser|sudo echo level 5 > /proc/acpi/ibm/fan}} runs the echo command as root, but the writing to the proc file is done as your user. Running {{cmduser|sudo -s}} gives you a root shell where the write to the fan file is done as root. - [[User:Kelsin|Kelsin]] 01:16, 17 August 2008 (CEST)
 +
* One might, however, do {{cmduser|sudo sh -c 'echo level 5 > /proc/acpi/ibm/fan'}} instead.
 +
 
==Windows XP port==
 
==Windows XP port==
 
How would I port this patch to Windows XP?  
 
How would I port this patch to Windows XP?  
Line 41: Line 47:
  
 
== Updated script for unpatched kernels ==
 
== Updated script for unpatched kernels ==
 +
Moved to the [[ACPI fan control script]] article page, after joint development by [[User:Spiney|Spiney]] and [[User:Thinker|Thinker]].
  
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A couple of command line options added, plus this version is able to daemonize and writes a pid file (to a custom location if needed). It's for an unpatched version of the kernel, since I think that's the way to go, but it should be easy to merge into the other version as well since it doesn't change any internals.
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== whats the problem kernel 2.6.14 ==
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Any feedback appreciated.
 
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Here we go:
 
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<pre>
 
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#!/bin/bash
 
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# This script dynamically controls fan speed on some ThinkPad models
 
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# according to user-defined temperature thresholds.  It implements its
 
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# own decision algorithm, overriding the ThinkPad embedded
 
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# controller. It also implements a workaround for the fan noise pulse
 
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# experienced every few seconds on some ThinkPads.
 
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#
 
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# WARNING: This script relies on undocumented hardware features and
 
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# overrides nominal hardware behavior. It may thus cause arbitrary
 
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# damage to your laptop or data. Watch your temperatures!
 
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#
 
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# This file is placed in the public domain and may be freely distributed.
 
  
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LEVELS=(    0      2      4      7)  # Fan speed levels
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hi all,
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UP_TEMPS=(      52    60    68  )  # Speed increase trip points
 
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DOWN_TEMPS=(  48    56    64    )  # Speed decrease trip points
 
  
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ANTIPULSE=( 0      1      0      0)  # Prevent fan pulsing noise at this level
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i patched the kernel with the patch for 2.6.14 with the option:
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                                    #   (this also prevents fan speed updates)
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/usr/src/linux # patch -p0 -l -i ../ibm_acpi.patch (which i copy&pasted)
  
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IBM_ACPI=/proc/acpi/ibm
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they dont show me errors or so. but after i reboot and load the modul ibm_acpi i cant see any /proc/acpi/ibm/fan
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PID_FILE=/var/run/tp-fancontrol.pid
 
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INTERVAL=3
 
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VERBOSE=true
 
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DRY_RUN=false
 
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DAEMONIZE=false
 
  
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usage() {
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whats the problem? copy&past ( tab -> space?)
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        echo "Usage: $0 [OPTION]..."
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or is it a problem in my kernel config?
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        echo
 
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        echo "Available options:"
 
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        echo "  -t    test mode"
 
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        echo "  -q    quiet mode"
 
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        echo "  -d    daemon mode, go into background, implies -q"
 
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        echo "  -p    pid file location for daemon mode, default: $PID_FILE"
 
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exit 1
 
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}
 
  
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while getopts 'qtdp:h' OPT; do
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greetings and big thx from .ch,
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        case "$OPT" in
 
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                t)
 
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                        DRY_RUN=true
 
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                        ;;
 
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                q) # quiet mode
 
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                        VERBOSE=false
 
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                        ;;
 
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                d) # go into background and daemonize
 
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                        DAEMONIZE=true
 
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                        ;;
 
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                p) # different pidfile
 
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                        PID_FILE="$OPTARG"
 
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                        ;;
 
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                h) # short help
 
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                        usage
 
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                        ;;
 
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                \?) # error
 
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                        usage
 
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                        ;;
 
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        esac
 
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done
 
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[[ $OPTIND -gt $# ]] || usage  # no non-option args
 
  
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if $DRY_RUN; then
 
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        echo "$0: Dry run, will not change fan state."
 
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        VERBOSE=true
 
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        DAEMONIZE=false
 
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fi
 
  
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if $DAEMONIZE ; then
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system: ibm thinkpad t43p
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        if [[ -e "$PID_FILE" ]]; then
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kernel: 2.6.14
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                echo "$0: File $PID_FILE already exists, refusing to run."
 
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                exit 1
 
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        else
 
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                exec $0 -q -p "$PID_FILE" 0<&- 1>&- 2>&- &
 
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                echo $! > "$PID_FILE"
 
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                exit 0
 
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        fi
 
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fi
 
  
 +
--[[User:62.203.29.204|62.203.29.204]] 19:22, 9 Nov 2005 (CET)kru
  
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# Enable the fan in default mode if anything goes wrong:
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You need to pass the "<tt>experimental=1</tt>" module parameter to ibm-acpi:
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set -e -E -u
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# modprobe ibm_acpi experimental=1
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$DRY_RUN || trap "rm -f $PID_FILE 2> /dev/null; echo enable > $IBM_ACPI/fan; exit 0" EXIT HUP INT ABRT QUIT SEGV TERM
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--[[User:Thinker|Thinker]] 21:01, 9 Nov 2005 (CET)
  
 +
big thx!!! problem solved.
  
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thermometer() { # output list of temperatures
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--[[User:62.203.29.204|62.203.29.204]]
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    read X Y < $IBM_ACPI/thermal
 
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    if ! [[ "$X" == "temperatures:" ]]; then
 
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        echo "$0: Bad temperatures: $X $Y" >&2
 
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        exit 1
 
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    fi
 
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    echo "$Y";
 
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}
 
  
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speedometer() { # output fan speed RPM
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== Fan control does not work with Suse 10.1 ? ==
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    sed -n 's/^speed:[ \t]*//p' $IBM_ACPI/fan
 
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}
 
  
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setlevel() { # set fan speed level
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Hi,
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    $DRY_RUN || echo 0x2F $1 > $IBM_ACPI/ecdump
 
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}
 
  
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IDX=0
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I successfully installed and used the fan control script on my T43p with Suse 10.0.
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MAX_IDX=$(( ${#LEVELS[@]} - 1 ))
 
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SETTLE=0
 
  
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while true; do
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Yesterday, I installed Suse 10.1 from scratch. Unfortunately fan control does not work with Suse 10.1:
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    TEMPS=`thermometer`
 
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    $VERBOSE && SPEED=`speedometer`
 
  
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    # Calculate new level
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\# echo level 2 > /proc/acpi/ibm/fan
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    NEWIDX=$IDX
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bash: echo: write error: Invalid argument
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    DOWN=$(( IDX > 0 ))
 
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    for TEMP in $TEMPS; do
 
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        # Increase speed as much as needed
 
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        while [[ $NEWIDX -lt $MAX_IDX ]] &&
 
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              [[ $TEMP -ge ${UP_TEMPS[$NEWIDX]} ]]; do
 
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            (( NEWIDX ++ ))
 
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            DOWN=0
 
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        done
 
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        # Allow decrease (by one index)?
 
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        if [[ $DOWN == 1 ]] &&
 
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          [[ $TEMP -gt ${DOWN_TEMPS[$(( IDX - 1 ))]} ]]; then
 
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            DOWN=0
 
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        fi
 
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    done
 
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    if [[ $DOWN == 1 ]]; then
 
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        NEWIDX=$(( IDX - 1 ))
 
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    fi
 
  
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    # Transition
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Are there any substantial differences between Suse 10.0 and 10.1 with respect to ibm_acpi?
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    OLDLEVEL=${LEVELS[$IDX]}
 
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    NEWLEVEL=${LEVELS[$NEWIDX]}
 
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    $VERBOSE && echo "tpfan: Temps: $TEMPS  Fan: $SPEED  Level: $OLDLEVEL->$NEWLEVEL"
 
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    setlevel $NEWLEVEL
 
  
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    sleep $INTERVAL
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* You need to pass the fan_control=1 parameter to the thinkpad_acpi module when it's loaded into the kernel. This can be done manually with
  
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    # If needed, apply anti-pulsing hack after a settle-down period:
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# modprobe thinkpad_acpi fan_control=1
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    if [[ ${ANTIPULSE[${NEWIDX}]} == 1 ]]; then
 
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        if [[ $NEWLEVEL == $OLDLEVEL ]]; then
 
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            if [[ $SETTLE -ge 0 ]]; then
 
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                (( SETTLE -= INTERVAL ))
 
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            else
 
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                setlevel 0x40 # disengaged
 
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                sleep 0.5
 
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            fi
 
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        else
 
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            SETTLE=6
 
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        fi
 
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    fi
 
  
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    IDX=$NEWIDX
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You'll have to read up on suse config to figure out how to do that automatically. With Gentoo it involves putting a file in {{path|/etc/modprobe.d/}} then running {{cmdroot|update-modules}} to have it update {{path|/etc/modprobe.conf}}. Other distros might have you just edit {{path|/etc/modprobe.conf}} directly but I wouldn't know. - [[User:Kelsin|Kelsin]] 01:16, 17 August 2008 (CEST)
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done
 
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</pre>
 
  
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As usual, I disclaim all warranty for this script, and release it to the public domain (meaning you may use and further distribute it under any terms you wish, including incorporating it into other software).
+
== Speed Control Patch for 2.6.18? ==
  
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--[[User:Spiney|Spiney]], Nov 7 2005, 19:46 (CET)
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Hi All.
−
----
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I'm trying to apply the speed control patch to vanilla 2.6.18 but it looks like it failed. Anyone who can point me to a direction for 2.6.18 patch?
 +
Thanks
  
−
Hi,
+
== ibm-acpi-0.12a-2.6.17-fan.patch broken? ==
−
 
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The code is not completed.
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I made a few changses (in your code above, for easy diff) to make the opt parsing safer and improve daemon mode. The indentation needs to be made consistently 4, but I didn't fix that to avoid trashing the diff.
 
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--[[User:Thinker|Thinker]] 13:37, 8 Nov 2005 (CET)
 
−
----
 

Latest revision as of 18:55, 19 August 2008

Using sudo

Any idea why I have to use sudo -s first instead of just using sudo <command>?

  • Just using $ sudo echo level 5 > /proc/acpi/ibm/fan runs the echo command as root, but the writing to the proc file is done as your user. Running $ sudo -s gives you a root shell where the write to the fan file is done as root. - Kelsin 01:16, 17 August 2008 (CEST)
  • One might, however, do $ sudo sh -c 'echo level 5 > /proc/acpi/ibm/fan' instead.

Windows XP port

How would I port this patch to Windows XP?

--Jason

You can't. But you can write a Windows device driver based on the specs and ibm-acpi.

--Thinker 18:54, 7 Nov 2005 (CET)

gkrellm support

I can confirm that it works on Thinkpad T43 here. However after applying the patch, the fan speed monitor of gkrellm 2.2.7 cannot read value correctly. Maybe we gkrellm is reading the second line for speed but instead find the line for level, so it got confused? Would it be possible to interchange the lines so that speed still appears in the second line and level appears in the third instead? I'm no coder, just a suggestion to improve the patch.

--Jiang

I'd say it's a bug in gkrellm. It should parse the line header rather than relying on line numbers. But feel free to change (and test) the patch if you wish.

--Thinker 05:14, 26 Oct 2005 (CEST)

patch to keep gkrell working against 2.6.14

As in "works for me on a T43p", use with caution at your own risk. And thanks to thinker for the original patch, very nice work.

(See article for the actual patch)

--Spiney

Looks excellent, why not add it to the article page? Also, care to provide a license (preferably public domain like my patch) so the kernel guys can handle it? Speaking of which, the kernel people seem to like their patches generated via "diff -up vanilla-kernel-2.6.14 patched-kernel-2.6.14".

--Thinker 22:04, 1 Nov 2005 (CET)

Done, using the -p option for diff and "borrowing" your sentence for licensing purposes.

--Spiney

Updated script for unpatched kernels

Moved to the ACPI fan control script article page, after joint development by Spiney and Thinker.

whats the problem kernel 2.6.14

hi all,

i patched the kernel with the patch for 2.6.14 with the option: /usr/src/linux # patch -p0 -l -i ../ibm_acpi.patch (which i copy&pasted)

they dont show me errors or so. but after i reboot and load the modul ibm_acpi i cant see any /proc/acpi/ibm/fan

whats the problem? copy&past ( tab -> space?) or is it a problem in my kernel config?

greetings and big thx from .ch,


system: ibm thinkpad t43p kernel: 2.6.14

--62.203.29.204 19:22, 9 Nov 2005 (CET)kru

You need to pass the "experimental=1" module parameter to ibm-acpi: 

# modprobe ibm_acpi experimental=1

--Thinker 21:01, 9 Nov 2005 (CET)

big thx!!! problem solved.

--62.203.29.204

Fan control does not work with Suse 10.1 ?

Hi,

I successfully installed and used the fan control script on my T43p with Suse 10.0.

Yesterday, I installed Suse 10.1 from scratch. Unfortunately fan control does not work with Suse 10.1:

\# echo level 2 > /proc/acpi/ibm/fan bash: echo: write error: Invalid argument

Are there any substantial differences between Suse 10.0 and 10.1 with respect to ibm_acpi?

  • You need to pass the fan_control=1 parameter to the thinkpad_acpi module when it's loaded into the kernel. This can be done manually with
# modprobe thinkpad_acpi fan_control=1

You'll have to read up on suse config to figure out how to do that automatically. With Gentoo it involves putting a file in /etc/modprobe.d/ then running # update-modules to have it update /etc/modprobe.conf. Other distros might have you just edit /etc/modprobe.conf directly but I wouldn't know. - Kelsin 01:16, 17 August 2008 (CEST)

Speed Control Patch for 2.6.18?

Hi All. I'm trying to apply the speed control patch to vanilla 2.6.18 but it looks like it failed. Anyone who can point me to a direction for 2.6.18 patch? Thanks

ibm-acpi-0.12a-2.6.17-fan.patch broken?

The code is not completed.

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