Acer Extensa 5510 - Manual (Page 105)

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Power management
This computer has a built-in power management unit that monitors system
activity. System activity refers to any activity involving one or more of the
following devices: keyboard, mouse, hard disk, peripherals connected to the
computer, and video memory. If no activity is detected for a period of time
(called an inactivity timeout), the computer stops some or all of these devices in
order to conserve energy.
This computer employs a power management scheme that supports the
advanced configuration and power interface (ACPI), which allows for maximum
power conservation and maximum performance at the same time. Windows
handles all power-saving chores for your computer.