ECS ES10IS2, Service Manual

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Chapter 1 General System Description
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2.2.6 PCI Device
All the PCI devices will occupy the system resources, such as I/O, Memory and IRQ, especially the IRQ
assignment is relative to H/W and system arrangement. The following will list all PCI devices:
2.3. Power Management
2.3.1 General Requirement
The purpose of the Power Management (PM) is that trying to reduce the power consumption in the system then
extent the battery life, increase the time to use without recharging the battery. The Advanced Configuration and Power
Interface (ACPI) specification is the latest and better PM method and will replace the traditional APM and PNP
functions. ACPI is a kind of Operating System Directed Power Management (OSPM), that is, the OS will control the
system/devices to enter proper power-saving mode and determine when to do it.
The BIOS should provide the ACPI table that is written by ASL language, to tell the OS how to setup and control
the system/devices’ the configuration and the power-saving mode. So the system H/W, BIOS and drivers must be meet
the ACPI specification:

ACPI compliant

Supporting processor power state C0, C1 and C2

Supporting system state S0, S3, S4 and S5
First of all, the next section will depict the power management state transition, then describe the definition for
each system state.