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<page xmlns="http://projectmallard.org/1.0/"
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xmlns:its="http://www.w3.org/2005/11/its"
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xmlns:if="http://projectmallard.org/if/1.0/"
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type="topic" style="question"
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id="power-hibernate">
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<link type="guide" xref="power"/>
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<desc>Hibernate saves your state, but completely switches off the power.</desc>
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<revision pkgversion="3.4.0" date="2012-02-20" status="review"/>
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<desc>Hibernate is disabled by default since it's not well supported.</desc>
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<revision pkgversion="3.6.0" date="2012-08-14" status="review"/>
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<credit type="author">
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<name>GNOME Documentation Project</name>
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<name>Ekaterina Gerasimova</name>
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<email>kittykat3756@gmail.com</email>
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<credit type="author">
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<name>Jeremy Bicha</name>
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<email>jbicha@ubuntu.com</email>
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<include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
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<title>What happens when I hibernate my computer?</title>
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<title>How do I hibernate my computer?</title>
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<p>When the computer <em>hibernates</em>, all of your applications and
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documents are stored and the computer completely switches off so it does not
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use any power, but the applications and documents will still be open when you
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switch on the computer again. You cannot hibernate the computer yourself, but you can set <gui>Hibernate</gui> as the default action for when your computer battery is critically low:</p>
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<p>Click your name on the top bar and select <gui>System Settings</gui>.</p>
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<p>Open <gui>Power</gui>.</p>
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<p>Change the <gui>When power is critically low</gui> option to <gui>Hibernate</gui>.</p>
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<p>Some computers have problems with hardware support which mean that they
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<link xref="power-suspendfail">may not be able to suspend or hibernate
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properly</link>. It is a good idea to test hibernate on your computer to see if
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switch on the computer again.</p>
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<p>Unfortunately, hibernate <link xref="power-suspendfail">doesn't work</link>
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in many cases, which can cause you to lose data if you expect your documents
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and applications to re-open when you switch your computer back on. Therefore,
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hibernate is disabled by default.</p>
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<section id="test-hibernate">
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<title>Test if hibernate works</title>
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<note style="important">
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<title>Always save your work before hibernating</title>
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recovered when you switch on the computer again.</p>
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<p>You can use the command line to test if hibernate works on your computer.</p>
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<if:when test="platform:unity">
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<p>Open the <app>Terminal</app> by pressing <keyseq><key>Ctrl</key>
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<key>Alt</key><key>t</key></keyseq> or by searching for <input>terminal</input>
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in the <gui>dash</gui>.</p>
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<p>Open the <app>Terminal</app> by searching for <input>terminal</input>
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in the <gui>Activities overview</gui>.</p>
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<p>As root, type <cmd>pm-hibernate</cmd> into the terminal and press <key>Enter</key>.</p>
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<p>Enter your password when prompted.</p>
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<p>After you computer turns off, switch it back on. Did your open applications
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<p>If hibernate doesn't work, check if your swap partition is at least as large as your
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<section id="enable-hibernate">
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<title>Enable hibernate</title>
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<p>If the hibernate test works, you can continue to use the <cmd>pm-hibernate</cmd>
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command when you want to hibernate.</p>
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<p>You can also enable the hibernate option in the menus. To do that, use your favorite text
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editor to create <file>/etc/polkit-1/localauthority/50-local.d/org.gnome.enable-hibernate.pkla</file>.
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Add the following to the file and save:</p>
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<code its:translate="no">
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[Re-enable hibernate by default]
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Action=org.freedesktop.upower.hibernate
b'\\ No newline at end of file'
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gnome-help/C/power-hibernate.page
