Dell Latitude E5440 User's Guide download pdf (Page 35)

Power Management Modes

The following section describes the various power management modes available in Windows.

Power management modes helps you reduce the power consumption of your computer by regulating

power supply to the various components. The system setup and the operating system allows you to

configure when the power supply to certain components should be reduced or cut off.

Some common power-saving states in Microsoft Windows are:

Table 2. Power-Saving States

Sleep Sleep is a power-saving state that allows a computer to quickly resume full-power

operation (typically within several seconds) when you want to start working again.

Putting your computer into the sleep state is like pausing a DVD player; the computer

immediately stops what it is doing and is ready to start again when you want to

resume working.

Hibernation Hibernation is a power-saving state designed primarily for laptops. While sleep puts

your work and settings in memory and draws a small amount of power, hibernation

puts your open documents and programs on your hard disk, and then turns off your

computer. Of all the power-saving states in Windows, hibernation uses the least

amount of power. On a laptop, use hibernation when you know that you would not

use your laptop for an extended period and would not have an opportunity to charge

the battery during that time.

Hybrid sleep Hybrid sleep is designed primarily for desktop computers. Hybrid sleep is a

combination of sleep and hibernate states; it puts any open documents and programs

in memory and on your hard disk, and then puts your computer into a low-power

state so that you can quickly resume your work. That way, if a power failure occurs,

Windows can restore your work from your hard disk. When hybrid sleep is turned on,

putting your computer into sleep automatically puts your computer into hybrid sleep.

Hybrid sleep is typically turned on by default on desktop computers.

Power Plans

A power plan is a collection of hardware and system settings that manages how your computer uses

power. Power plans can help you save energy, maximize system performance, or achieve a balance

between the two.

Windows 8 and Windows 7 provide the following power plans:

1. Balanced

2. Power saver

3. High performance

4. Custom power plan

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Dell Latitude E5440 User's Guide Page 35