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