Acer Aspire E1-521 - Manual (Page 46)

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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.
Acer PowerSmart key
Note: This feature is only available on certain models.
Acer PowerSmart uses the power-saving features of your computer's graphics sub-
system to reduce overall power consumption. When you press the Acer
PowerSmart key, the screen brightness is reduced and the graphics chip switched
to a lower speed; PCI and WLAN switch to power-saving modes. Press the Acer
PowerSmart key again to return to your previous settings.