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.TH PWMCONFIG 8 "September 28, 2008" "lm-sensors 3"
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pwmconfig \- tests the PWM outputs of sensors and configures fancontrol
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\fBpwmconfig\fR will attempt to stop your fans, one at a time, for
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approximately 5 seconds each. This may cause your processor
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temperature to rise. Verify that all fans are running at normal speed
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after this program has exited.
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\fBpwmconfig\fR does its best to check that the fans are spinning when
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they are supposed to, but due to the diversity of available
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motherboards and fans, it shouldn't be blindly trusted. Always verify
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It is strongly recommended to run \fBpwmconfig\fR at a time when there
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is no significant system load, to minimize the risk of overheating.
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searches your sensors for pulse width modulation (PWM)
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controls, and tests each one to see if it controls a fan on
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your motherboard. Note that many motherboards do not have PWM
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circuitry installed, even if your sensor chip supports PWM.
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When a connection is established between a PWM control and a fan,
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\fBpwmconfig\fR can generate a detailed correlation, to show how a
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given fan is responding to various PWM duty cycles.
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Lastly, \fBpwmconfig\fR will enter in \fBfancontrol\fR configuration
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mode (unless you decide to skip that part.) In this mode, you are
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invited to enter several parameters which will determine how the
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\fBfancontrol\fR daemon regulates the speed of one or more fans in
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your system based on temperature measurements. In particular, you will
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have the opportunity to establish mappings between fans and
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temperature inputs, define the temperature range over which the speed
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of the fan should be adjusted dynamically, the minimum speed at which
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the fan should spin, etc. See fancontrol(8) for additional
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The term "PWM" is used because most fan control systems in computers
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are based on pulse width modulation. Some motherboards however use DC
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variation instead. So, the term "PWM" should be seen as a generic term
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for "fan speed control", regardless of the actual method used.
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fancontrol(8), sensors(1).
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Marius Reiner <marius.reiner@hdev.de>,
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Jean Delvare <jdelvare@suse.de>
added
removed
prog/pwm/pwmconfig.8
