9 comments
  Email this

Posted on Sunday, October 1st, 2006 3:47:00 GMT by: quietearth
Posted under: ubuntu lm-sensors temperate

One of the basic things you need, especially if you build your own boxes like I do, is to be able to watch cpu temperatures, voltages, fan speeds, etc. This is easily done with the lm-sensors package in conjuction with code which is available for most types of motherboards in the kernel. This is pretty straightforward, first off lets install lm-sensors:
# apt-get install lm-sensors

Once that's done we need to create the i2c device files and unfortunately this isn't done automatically, so we can grab the necessary script from the lm-sensors source package, use this link, or cut-n-paste this:
--cut here--
#!/bin/bash

# Here you can set several defaults.

# The number of devices to create (max: 256)
NUMBER=32

# The owner and group of the devices
OUSER=root
OGROUP=root
# The mode of the devices
MODE=600

# 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."
exit;
fi
fi

i=0;

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]
done
--cut here--

After running that script, we can then run sensors-detect to figure out our motherboard type:
# sensors-detect

This might hang your system while probing for the right motherboard, but if it doesn't all the questions are pretty straightforward and you can usually just hit enter for everything. At the end it will ask if you want to add the necessary kernel modules to /etc/modules, answer YES. You can then reboot to load everything, or take a look at /etc/modules and manually modprobe each one IN THE ORDER it's in the file. Then run the sensors command and we get this:
# sensors
V1.5:      +2.467 V  (min =  +1.42 V, max =  +1.58 V)   ALARM
VCore:     +1.479 V  (min =  +1.48 V, max =  +1.63 V)   ALARM
V3.3:      +3.373 V  (min =  +3.13 V, max =  +3.47 V)
V5:       +5.000 V  (min =  +4.74 V, max =  +5.26 V)
V12:      +11.734 V  (min = +11.38 V, max = +12.62 V)
CPU_Fan:   2299 RPM  (min = 4000 RPM)                     ALARM
fan2:         0 RPM  (min =    0 RPM)
fan3:      1057 RPM  (min =    0 RPM)
fan4:         0 RPM  (min =    0 RPM)
CPU:      +41.50°C  (low  =   +10°C, high =   +50°C)
Board:    +35.25°C  (low  =   +10°C, high =   +35°C)
Remote:   +35.50°C  (low  =   +10°C, high =   +35°C)     ALARM
CPU_PWM:   144
Fan2_PWM:  112
Fan3_PWM:  112
vid:      +1.550 V  (VRM Version 9.0)

If you want to monitor things under gnome their is a handy applet for that:
# apt-get install sensors-applet

But really at this point you should reboot. If you need to change incorrect scaling or set temperature lower/upper limits, just modify /etc/sensors.conf.

Tested under dapper and edgy.
Under feisty, you do not need to install any packages or run the above script. Just run sensors-detect and reboot. The sensors applet is the same place as always.

Related articles

Ubuntu: Ripping in mp3 with id3 tags

Posted on Monday, August 21st, 2006 18:41:02 GMT by: quietearth |   7 comments

Ubuntu: Enabling remote X-windows

Posted on Thursday, August 24th, 2006 21:47:33 GMT by: quietearth |   3 comments

Ubuntu: Installing bitpim

Posted on Tuesday, September 12th, 2006 3:13:27 GMT by: quietearth |   8 comments

Ubuntu: Compiling a custom kernel

Posted on Friday, September 15th, 2006 22:53:55 GMT by: quietearth |   5 comments

Ubuntu: Sending command line mail

Posted on Monday, September 25th, 2006 19:34:12 GMT by: quietearth |   7 comments