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Thread: HOW TO: Install and configure lm-sensors

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  1. #1
    Join Date
    Oct 2004
    Paradise Island, Bahamas
    Ubuntu 11.04 Natty Narwhal

    HOW TO: Install and configure lm-sensors

    Howto Install and Configure lm-sensors

    1. Install lm-sensors using apt-get or the Synaptic GUI.

    sudo apt-get install lm-sensors

    2. Run the script in the lm-sensors source. It is extacted below:

    a. Copy the script file below to a text editor and save it to a file named


    # Here you can set several defaults.

    # The number of devices to create (max: 256)

    # The owner and group of the devices
    # The mode of the devices

    # This script doesn't need to be run if devfs is used
    if [ -r /proc/mounts ] ; then
    if grep -q "/dev devfs" /proc/mounts ; then
    echo "You do not need to run this script as your system uses devfs."


    while [ $i -lt $NUMBER ] ; do
    echo /dev/i2c-$i
    mknod -m $MODE /dev/i2c-$i c 89 $i || exit
    chown "$OUSER:$OGROUP" /dev/i2c-$i || exit
    i=$[$i + 1]
    #end of file

    b. Make the file executable:

    chmod 755

    c. Run from the current directory

    sudo ./

    3. Now run sensors-detect and answer YES to all YES/no questions. I generally use the ISA bus rather than the SMBus bus, your choice to this question!. At the end of the detection phase, a list of modules that needs to be loaded will displayed. You will need to write these down or print the list for the next steps.

    sudo sensors-detect

    Below is an example of results from sensors-detect:
    #************************************************* *****************************
    To make the sensors modules behave correctly, add these lines to

    #----cut here----
    # I2C adapter drivers
    # I2C chip drivers
    #----cut here----

    Then, run /etc/init.d/module-init-tools

    To make the sensors modules behave correctly, add these lines to
    /etc/modprobe.d/local and run update-modules:

    #----cut here----
    # I2C module options
    alias char-major-89 i2c-dev
    #----cut here----
    #************************************************* *******************************

    4. In this example, we add the modules in reverse order (order is critical!) in "/etc/modules".

    #************************************************* ***********************
    # /etc/modules: kernel modules to load at boot time.
    # This file should contain the names of kernel modules that are
    # to be loaded at boot time, one per line. Comments begin with
    # a "#", and everything on the line after them are ignored.


    #For lm-sensors, i2c modules

    #end of file!
    #************************************************* ****************

    4. I found that there was no "/etc/modprobe.d/local" and that "alias char-major-89 i2c-dev" was already listed in "/etc/modprobe.d/aliases". So, nothing to do here.

    5.Now load the modules manually using modprobe and update the dependencies.

    sudo modprobe i2c-sensor
    sudo modprobe i2c-viapro
    sudo modprobe i2c-isa
    sudo modprobe it87

    sudo depmod -a <may not be needed!>
    sudo update-modules <may not be needed!>

    6. Now test the sensor output using the lm-sensors utility "sensors".


    ************************************************** *****************
    Adapter: ISA adapter
    VCore 1: +1.57 V (min = +1.42 V, max = +1.57 V) ALARM
    VCore 2: +2.66 V (min = +2.40 V, max = +2.61 V) ALARM
    +3.3V: +6.59 V (min = +3.14 V, max = +3.46 V) ALARM
    +5V: +5.11 V (min = +4.76 V, max = +5.24 V)
    +12V: +11.78 V (min = +11.39 V, max = +12.61 V)
    -12V: -19.14 V (min = -12.63 V, max = -11.41 V) ALARM
    -5V: +0.77 V (min = -5.26 V, max = -4.77 V) ALARM
    Stdby: +5.00 V (min = +4.76 V, max = +5.24 V)
    VBat: +3.12 V
    fan1: 3668 RPM (min = 0 RPM, div =
    fan2: 0 RPM (min = 664 RPM, div = ALARM
    fan3: 0 RPM (min = 2657 RPM, div = 2) ALARM
    M/B Temp: +39C (low = +15C, high = +40C) sensor = thermistor
    CPU Temp: +36C (low = +15C, high = +45C) sensor = thermistor
    Temp3: +96C (low = +15C, high = +45C) sensor = diode
    ************************************************** ********************

    7. Reboot Ubuntu and the sensors should now be detected during the boot process properly!

    8. The sensor output may be tweaked by editing the "/etc/sensors.conf" file. It is possible to correct inacurate scaling too. For details check "man sensors.conf.
    Last edited by emperor; November 1st, 2004 at 06:27 PM.
    100% Linux/BSD @Home: Ubuntu -hp6810,Desktop,Server,MythTV. hpdm4. M0n0WALL -fw/router.

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