Linux Ecology-HOWTO
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Chapter 1. Reduction of Power Consumption

Table of Contents
1.1. Advanced Power Management (APM/ACPI)
1.1.1. ACPI
1.1.2. Older hardware with APM
1.1.3. Processor frequency scaling
1.1.4. Useful resources for power management
1.1.5. Restoring your Work after Shutdown
1.2. Power Management Unit - PMU (Apple PowerBook)
1.3. Turn Monitor off, use Keyboard LEDs
1.4. Screensavers
1.4.1. Screensaver Programs
1.4.2. Display Power Control
1.5. Virtual Servers
1.6. Energy Star Label
1.7. Using Spare CPU Cycles
1.8. Miscellaneous Power Saving Techniques

There are some means to save power when using a computer which are supported by Linux: Advanced Power Management, certain harddisk settings, working without monitor and others.

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About the Document and the Authors Advanced Power Management (APM/ACPI)