Difference between revisions of "Talk:Fan control scripts"

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(small change to fan script, success report)
(→‎<tt>bash</tt> script with fine control over fan speed (for unpatched kernels))
Line 19: Line 19:
 
Alas, at the moment I don't have a suitable to test it on. Can someone give it a try and report?
 
Alas, at the moment I don't have a suitable to test it on. Can someone give it a try and report?
  
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<pre>
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'''(fixed and moved to article)'''
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#!/bin/bash
 
  
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# This script dynamically controls fan speed on some ThinkPad models
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--[[User:Thinker|Thinker]] 15:07, 3 Nov 2005 (CET)
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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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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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IBM_ACPI was defined twice by accident I guess (changed above), but otherwise it seems to work fine, went from level 0 (cold machine) to 7 while compiling the kernel and now back to level 2 now at about 53 degrees Celsius.
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                                    #  (this also prevents fan speed updates)
 
  
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IBM_ACPI=/proc/acpi/ibm
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--[[User:spiney|spiney]] 10:31, 5 Nov 2005 (CET)
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INTERVAL=3
 
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VERBOSE=true
 
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DRY_RUN=false
 
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[[ "$1" == "-t" ]] && { DRY_RUN=true; echo "$0: Dry run, will not change fan state."; }
 
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# Enable the fan in default mode if anything goes wrong:
 
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set -e -E -u
 
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$DRY_RUN || trap "echo enable > $IBM_ACPI/fan; exit 0" EXIT HUP INT ABRT QUIT SEGV TERM
 
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thermometer() { # output list of temperatures
 
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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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    cat $IBM_ACPI/fan | sed '/^speed/!d; s/speed:[ \t]*//'
 
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}
 
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setlevel() { # set fan speed level
 
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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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MAX_IDX=$(( ${#LEVELS[@]} - 1 ))
 
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SETTLE=0
 
  
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while true; do
 
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    TEMPS=`thermometer`
 
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    $VERBOSE && SPEED=`speedometer`
 
  
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    # Calculate new level
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Oops, yes. The <tt>IBM_ACPI=/tmp</tt> was just for testing (in the temporary absense of a ThinkPad, I wrote stuff to {{path|/tmp/thermal}} manually to test the script...). Fixed and moved to the article. Thanks!
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    NEWIDX=$IDX
 
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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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--[[User:Thinker|Thinker]] 12:58, 5 Nov 2005 (CET)
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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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    # If needed, apply anti-pulsing hack after a settle-down period:
 
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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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done
 
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</pre>
 
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--[[User:Thinker|Thinker]] 15:07, 3 Nov 2005 (CET)
 
 
----
 
----
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IBM_ACPI was defined twice by accident I guess (changed above), but otherwise it seems to work fine, went from level 0 (cold machine) to 7 while compiling the kernel and now back to level 2 now at about 53 degrees Celsius.
 
−
 
−
--[[User:spiney|spiney]] 10:31, 5 Nov 2005 (CET)
 

Revision as of 12:58, 5 November 2005

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)

Here's an alternative variable speed control script that doesn't need the patch for controlling fan speed. It requires only ibm-acpi 0.11 or higher (e.g., as found in kernel 2.6.14 and higher) with the experimental=1 module parameter.

Alas, at the moment I don't have a suitable to test it on. Can someone give it a try and report?

(fixed and moved to article)

--Thinker 15:07, 3 Nov 2005 (CET)


IBM_ACPI was defined twice by accident I guess (changed above), but otherwise it seems to work fine, went from level 0 (cold machine) to 7 while compiling the kernel and now back to level 2 now at about 53 degrees Celsius.

--spiney 10:31, 5 Nov 2005 (CET)


Oops, yes. The IBM_ACPI=/tmp was just for testing (in the temporary absense of a ThinkPad, I wrote stuff to /tmp/thermal manually to test the script...). Fixed and moved to the article. Thanks!

--Thinker 12:58, 5 Nov 2005 (CET)

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