How can I control fan speed? On windows there is wonderful program called speedfan.
Note before starting:
This functionality depends on both your hardware and software. If your hardware doesn't support fan speed controls, or doesn't show them to the OS, it is very likely that you could not use this solution. If it does, but the software (aka kernel) doesn't know how to control it, you are without luck.
In my case for CPU I used:
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Install and configure the lm-sensors  and fancontrol  packages. This is a function that is supposed to be provided by ACPI compliant bios, but it seems that most motherboard vendors don't bother to follow the standard.
If you own a ThinkPad, there's a piece of software called
Here's an easy step-by-step guide:
(which is basically a translated version of this German guide: http://thinkwiki.de/Thinkfan)
Relevant Information from Post:
Step 1. Install the thinkfan software and the sensors:
Step 2. Make sure that the daemon controls the fan by editting the thinkpad.conf file:
by adding the following line:
Step 3. Make the daemon load automatically at start-up by editting the file:
making sure that the START key is set to yes, i.e. there should be a line that says:
Step 4. Detect your laptop's sensors:
and just choose YES whenever you're prompted.
Step 5. Load the new modules:
Step 6. Figure out which sensors are in use:
(the ones that indicate 0 degrees are not in use, I don't know why those are "detected" too). Remember which ones are in use.
Step 7. Find out the full paths of these sensors:
The output should be a list of paths like /sys/devices/...
Step 8. Copy-paste the paths to the sensors into the configuration file /etc/thinkpad.conf. To do this, first open up the file:
There should already be a line like
(the #-symbol means that that line is commented out). Add a line starting with sensor (without the #-symbol) and copy-paste you first sensor. Repeat this if you have more than one sensor. For example, on my machine, the output in step 7 yields
The ones that are in use in my machine are the ones in the first and the last two lines, so I added the three lines:
Step 9. Finally we can set the fan speed levels in the configuration file. Open the /etc/thinkpad.conf file if it wasn't open already.
The fan levels I use on my ThinkPad x201 are:
The last line ensures full fan speed (127 = "disengaged" i.e. unregulated). You can fiddle with these levels to fit your needs/wishes, but PLEASE BE CAREFUL!
For those people out there familiar with Mathematica, I wrote a short notebook to generate these fan speed values.
Step 10. Reboot. Everything should work now. In order to check whether thinkpad is runnning correctly, use
which starts thinkfan in verbose mode. You might want to stop the thinkfan daemon first:
If you want to start the thinkfan daemon again, type:
Just to be complete, my /etc/thinkfan.conf configuration file is:
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