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<title>Suspending and Hibernating Your Computer</title>
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<div class="sect1" title="Suspending and Hibernating Your Computer">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="pm-suspending"></a>Suspending and Hibernating Your Computer</h2>
</div>
</div>
</div>
<p>
In order to save power, you can put your computer into one of a number of
power-saving modes when you are not using it:</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>
<span class="strong"><strong>Suspending</strong></span> a computer is like
putting the computer to sleep. The computer will still be turned on and
all of your work will be left open, but it will use much less power.
You can wake the computer by pressing a key or clicking the mouse.
</p>
</li>
<li class="listitem">
<p>
<span class="strong"><strong>Hibernating</strong></span> is turning the computer
off completely while saving the current state of the computer (such as
keeping all of your open documents). When you turn the computer back on
after hibernating, all of your work should be restored as it was before
hibernation. No power is used when the computer is hibernating.
</p>
</li>
<li class="listitem">
<p>
<span class="strong"><strong>Shutting down</strong></span> is turning the
computer off completely, without saving the current state of the
computer. No power is used when the computer is shut down.
</p>
</li>
<li class="listitem">
<p>
<span class="strong"><strong>Resuming</strong></span> is bringing the computer
out of a power saving mode and back into normal operation. You can
resume the computer from being suspended by pressing a keyboard button
or by clicking the mouse. You can resume from being hibernated by
pressing the power button on your computer.
</p>
</li>
</ul>
</div>
<p>
You can manually put your computer into a power-saving mode by pressing
<span class="guimenu">Applications</span> → <span class="guisubmenu">Log Out</span> and then pressing the appropriate button.
</p>
<div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Caution]" src="common/images/admon/caution.png" />
</td>
<th align="left"></th>
</tr>
<tr>
<td align="left" valign="top">
<p>
Some computers may have problems going into certain power saving modes.
The best way of checking if your computer can handle a power-saving mode
is to try to switch to that mode and see if it behaves as you expected.
Always make sure you save important documents before suspending or
hibernating.
</p>
</td>
</tr>
</table>
</div>
<div class="sect2" title="My Computer Does Not Suspend or Hibernate Correctly">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="pm-suspend-hibernate-fails"></a>My Computer Does Not Suspend or Hibernate Correctly</h3>
</div>
</div>
</div>
<p>
Some computers are unable to suspend or hibernate correctly with Xubuntu.
If this is the case for your computer, you may notice some of the following
symptoms:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>
The computer does not turn off after you click to hibernate it.
</p>
</li>
<li class="listitem">
<p>
When you turn the computer on after hibernating it, your previously
open programs are not restored.
</p>
</li>
<li class="listitem">
<p>
The computer will not wake up after you have suspended it.
</p>
</li>
<li class="listitem">
<p>
Certain programs or hardware devices stop working correctly after
resuming from hibernation or waking-up from being suspended.
</p>
</li>
</ul>
</div>
<p>
If you suffer from any of these problems, you should report a bug to
<a class="ulink" href="https://bugs.launchpad.net/ubuntu/+filebug" target="_top">Launchpad</a>.
The problems will hopefully be fixed in a subsequent version of Xubuntu.
</p>
<p>
If your hardware does not work properly after suspending or hibernating
your computer, restart your computer and it should return to normal. If a
program does not work properly, try closing the program and then starting
it again.
</p>
<div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Caution]" src="common/images/admon/caution.png" />
</td>
<th align="left"></th>
</tr>
<tr>
<td align="left" valign="top">
<p>
Make sure that you save all of your open documents before testing for
suspend and hibernate problems.
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2" title="Why do I get a strange pattern on the screen when I hibernate my computer?">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="pm-hibernate-pattern"></a>Why do I get a strange pattern on the screen when I hibernate my
computer?</h3>
</div>
</div>
</div>
<p>
Your screen may show a black and white pattern just after you click to
hibernate your computer. This is usually nothing to worry about and is just
how the graphics cards of some computers respond to the initial stages of
the hibernation process.
</p>
<p>
If the computer displays the pattern for a prolonged period of time without
turning itself off then you may have a problem with hibernation. See
<a class="link" href="pm-suspending.html#pm-suspend-hibernate-fails" title="My Computer Does Not Suspend or Hibernate Correctly">My computer does not suspend
or hibernate correctly</a> for more information.
</p>
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