Building the Power-Efficient PC: A Developer's Guide to ACPI Power Management
This book provides developers and integrators with practical knowledge and design techniques for building PCs that address the increasing demand for energy conservation.
TABLE OF CONTENTS Building the Power-Efficient PC: A Developer's Guide to ACPI Power Management
Chapter 9: Desktop System Validation
Overview
Once a system has been designed and configured, validation is required to ensure the hardware, software, and peripherals interact properly. In this chapter, you ll learn about system validation using the power management concept system Intel designed and developed to debug the PCI PM specification, chipset components and operating system.
We recommend the following tests to validate systems:
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System power measurements.
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Dual power circuit validation.
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Resume time measurements.
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Functional validation including PCI add-in peripheral devices.
The tools used in this chapter are available from Intel and Microsoft, and can be found in the Microsoft Hardware Compatibility Test (HCT) test suite.
System Power Measurements
You have to make both AC and DC measurements to understand power delivery issues, power distribution efficiency of power supply, and power circuits in a system. The necessary measurement techniques are explained in the following sections.
Measuring System AC Power Dissipation
We ll use the following system configuration for power measurement examples:
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Windows 98 SE, Windows ME, or Windows 2000 operating system.
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ACPI-enabled BIOS.
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Pentium III processor.
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Intel 440BX, Intel 815 chipset with ACPI support.
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128 MB SDRAM memory.
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Quantum IDE hard drive.
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AGP graphics.
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CD-ROM drive.
The typical idle (not sleep) state power dissipation of a desktop system is 60-70 watts. In an idle state with the processor stopped and the rest of the electronics in a low power mode, typical system power drops to around 30 watts.
Figure 9.1 shows the lab setup for the measurements the power meter connects between the AC power plug and...
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