Linux Ecology-HOWTO
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# Chapter 3. Noise Reduction

Most of the noise emitted by a computer is produced by the fan, the harddisk and the speakers.

# Fan

- libsensors0 is a library to read temperature/voltage/fan sensors

- lm-sensors "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." http://www.lm-sensors.nu/

- ACPI, see APM chapter

- RTSensors 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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Alternative Power Supplies - Sun, Wind, Water |  | Harddisk