old-www/HOWTO/Ecology-HOWTO/ecology-howto-fan.html

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>3.1. Fan</H1
><P
>&#13;<P
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>&#13;<B
CLASS="command"
>libsensors0</B
> is a library to read temperature/voltage/fan sensors
</P
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>&#13;<A
HREF="http://www.lm-sensors.nu/"
TARGET="_top"
>lm-sensors</A
>:
"Kernel drivers to read
temperature/voltage/fan sensors. This is a module for reading the
temperature/voltage/fan sensors in Linux via the LM78/79 chip and
possibly sensors on the SMBus (System Management Bus, usually found in
P6 and P-II systems). The LM80 and a LM78-clone called W83781D are
also supported."
</P
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>&#13;
ACPI, see APM chapter
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><P
>&#13; <A
HREF="http://www.tinet.org/~com.ea/rtsensors/"
TARGET="_top"
>RTSensors</A
>
can be configured by the user as an expert controller: The user can
specify the max/min speed of the system fans, the maximum affordable
temperature and so on. The controller tries to reduce fan speed to reduce
noise while the temperature is in a safe range chosen by the user. So fan
speed is modified automatically by the control algorithm, you don't have to use
those mechanic or thermal regulators on your fans anymore.
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