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6 Managing power
Your computer can operate on either battery power or external power. When the computer is running on
battery power and an external power source is not available to charge the battery, it is important to monitor
and conserve the battery charge.
Some power management features described in this chapter might not be available on your computer.
Using Sleep and Hibernation
IMPORTANT: Several well-known vulnerabilities exist when a computer is in the Sleep state. To prevent an
unauthorized user from accessing data on your computer, even encrypted data, HP recommends that you
always initiate Hibernation instead of Sleep anytime the computer will be out of your physical possession.
This practice is particularly important when you travel with your computer.
IMPORTANT: To reduce the risk of possible audio and video degradation, loss of audio or video playback
functionality, or loss of information, do not initiate Sleep while reading from or writing to a disc or an external
media card.
Windows has two power-saving states, Sleep and Hibernation.
Sleep—The Sleep state automatically initiates after a period of inactivity. Your work is available in
memory, allowing you to resume your work quickly. You can also initiate Sleep manually. Depending on
your computer model, the Sleep state might also support Modern Standby mode. This mode keeps some
internal operations awake and enables your computer to receive web notications, such as emails, while
in Sleep. For more information, see Initiating and exiting Sleep on page 37.
Hibernation—The Hibernation state is automatically initiated if the battery reaches a critical level or the
computer has been in the Sleep state for an extended period of time. In the Hibernation state, your work
is saved to a hibernation le and the computer powers down. You can also initiate Hibernation manually.
For more information, see Initiating and exiting Hibernation (select products only) on page 38.
Initiating and exiting Sleep
You can initiate Sleep in any of the following ways:
Select the Start button, select the Power icon, and then select Sleep.
Close the display (select products only).
Press the Sleep hot key (select products only); for example, fn+f1 or fn+f12.
Briey press the power button (select products only).
You can exit Sleep in any of the following ways:
Briey press the power button.
If the computer is closed, raise the display (select products only).
Press a key on the keyboard (select products only).
Tap the touchpad (select products only).
When the computer exits Sleep, your work returns to the screen.
Using Sleep and Hibernation 37
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