Acer 1450 - Manual (Page 49)

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En
gli
shEnglish Power management
Your computer features a built-in power management unit that
constantly monitors system activity. System activity refers to any
activity involving one or more of the following devices: keyboard,
touchpad/mouse, floppy disk drive, hard disk drive, optical drive,
peripherals connected to the computer, and video memory. If no
activity is detected for a period of time (the settings are controlled in
Windows Power Management), the computer turns off some, or all, of
these devices in order to conserve power.
Your computer employs a power management scheme that supports
ACPI (Advanced Configuration and Power Interface), enabling
maximum power conservation without compromising system
performance. ACPI allows Windows to control the amount of power
given to each device attached to the computer. In this way, Windows
handles all power-saving chores for your computer. Refer to Windows
Help for more information.