Power management modes, Full power mode & maximum performance, Acpi – Asus E2915 User Manual

Page 49: Suspend mode, Power savings

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49

Using the Notebook PC

4

Power Management Modes

The Notebook PC has a number of automatic or adjustable power saving features that you can use to

maximize battery life and lower Total Cost of Ownership (TCO). You can control some of these features

through the Power menu in the BIOS Setup. ACPI power management settings are made through the

operating system. The power management features are designed to save as much electricity as possible

by putting components into a low power consumption mode as often as possible but also allow full

operation on demand. These low power modes are referred to as “Stand by” (or Suspend-to-RAM) and

“Hibernation” mode or Suspend-to-Disk (STD). The Standby mode is a simple function provided by the

operating system. When the Notebook PC is in either one of the power saving modes, the status will be

shown by the following: “Stand by”: Power LED Blinks and “Hibernation”: Power LED OFF.

Full Power Mode & Maximum Performance

The Notebook PC operates in Full Power mode when the power management function is disabled by

configuring Windows power management and SpeedStep. When the Notebook PC is operating in Full

Power Mode, the Power LED remains ON. If you are conscious of both system performance and power

consumption, select “Maximum Performance” instead of disabling all power management features.

ACPI

Advanced Configuration and Power Management (ACPI) was developed by Intel, Microsoft, and Toshiba

especially for Windows and later to control power management and Plug and Play features. ACPI is the

new standard in power management for Notebook PCs.

NOTE: APM was used in older operating systems like Windows NT4 and Windows 9.

Because newer operating systems like Windows XP, Windows 2000, and Windows ME

utilize ACPI, APM is no longer fully supported on this Notebook PC.

Suspend Mode

In “Stand by” (STR) and “Hibernation” (STD), the CPU clock is stopped and most of the Notebook PC

devices are put in their lowest active state. The suspend mode is the lowest power state of the Notebook

PC. The Notebook PC enters suspend mode when the system remains idle for a specified amount of time

or manually using the [Fn][F1] keys. The Power LED blinks when the Notebook PC is in STR mode.

In STD mode, the Notebook PC will appear to be powered OFF. Recover from STR by pressing any

keyboard button (except Fn). Recover from STD by using the power switch (just like powering ON the

Notebook PC).

Power Savings

In addition to reducing the CPU clock, this mode puts devices including the LCD backlight in their lower

active state. The Notebook PC enters “Stand by” mode (low priority) when the system remains idle for a

specified amount of time. The time-out can be set through Windows power management (higher priority).

To resume system operation, press any key.

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