1PWMCONFIG(8)                System Manager's Manual               PWMCONFIG(8)
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NAME

6       pwmconfig - tests the PWM outputs of sensors and configures fancontrol
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SYNOPSIS

10       pwmconfig
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WARNING

14       pwmconfig  will  attempt to stop your fans, one at a time, for approxi‐
15       mately 5 seconds each. This may cause  your  processor  temperature  to
16       rise.  Verify that all fans are running at normal speed after this pro‐
17       gram has exited.  pwmconfig does its best to check that  the  fans  are
18       spinning  when they are supposed to, but due to the diversity of avail‐
19       able motherboards and fans, it shouldn't  be  blindly  trusted.  Always
20       verify by yourself.
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22       It  is strongly recommended to run pwmconfig at a time when there is no
23       significant system load, to minimize the risk of overheating.
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DESCRIPTION

27       pwmconfig searches your sensors for pulse width modulation  (PWM)  con‐
28       trols,  and  tests each one to see if it controls a fan on your mother‐
29       board. Note that many motherboards do not have PWM circuitry installed,
30       even if your sensor chip supports PWM.
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32       When  a connection is established between a PWM control and a fan, pwm‐
33       config can generate a detailed correlation, to show how a given fan  is
34       responding to various PWM duty cycles.
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36       Lastly,  pwmconfig  will enter in fancontrol configuration mode (unless
37       you decide to skip that part.) In this mode, you are invited  to  enter
38       several parameters which will determine how the fancontrol daemon regu‐
39       lates the speed of one or more fans in your system based on temperature
40       measurements. In particular, you will have the opportunity to establish
41       mappings between fans and temperature inputs,  define  the  temperature
42       range  over  which the speed of the fan should be adjusted dynamically,
43       the minimum speed at which the fan should spin, etc. See  fancontrol(8)
44       for additional information.
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BUGS

48       The  term  "PWM"  is used because most fan control systems in computers
49       are based on pulse width modulation. Some motherboards however  use  DC
50       variation  instead. So, the term "PWM" should be seen as a generic term
51       for "fan speed control", regardless of the actual method used.
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SEE ALSO

55       fancontrol(8), sensors(1).
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AUTHORS

59       Marius Reiner <marius.reiner@hdev.de>, Jean Delvare <jdelvare@suse.de>
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63lm-sensors 3                  September 28, 2008                  PWMCONFIG(8)
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