<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Fan</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Linux Ecology-HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Noise Reduction" HREF="ecology-howto-noise-reduction.html"><LINK REL="PREVIOUS" TITLE="Noise Reduction" HREF="ecology-howto-noise-reduction.html"><LINK REL="NEXT" TITLE="Harddisk" HREF="ecology-howto-hdd.html"></HEAD ><BODY CLASS="sect1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Linux Ecology-HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="ecology-howto-noise-reduction.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 3. Noise Reduction</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="ecology-howto-hdd.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="ecology-howto-fan" ></A >3.1. Fan</H1 ><P > <P ></P ><UL ><LI ><P > <B CLASS="command" >libsensors0</B > is a library to read temperature/voltage/fan sensors </P ></LI ><LI ><P > <B CLASS="command" >lm-sensors</B > "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." <A HREF="http://www.lm-sensors.nu/" TARGET="_top" >http://www.lm-sensors.nu/</A > </P ></LI ><LI ><P > ACPI, see APM chapter </P ></LI ><LI ><P > <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. </P ></LI ></UL > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="ecology-howto-noise-reduction.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="ecology-howto-hdd.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Noise Reduction</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecology-howto-noise-reduction.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Harddisk</TD ></TR ></TABLE ></DIV ></BODY ></HTML >