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/usr/share/help/kn/gnome-help/power-whydim.page is in gnome-user-guide 3.14.1-1.

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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="question" id="power-whydim" xml:lang="kn">

  <info>
    <link type="guide" xref="power#battery"/>
    <link type="guide" xref="hardware-problems-graphics"/>

    <revision pkgversion="3.7.1" version="0.2" date="2012-11-16" status="outdated"/>
    <revision pkgversion="3.10" date="2013-10-29" status="review"/>

    <credit type="author">
      <name>GNOME Documentation Project</name>
      <email its:translate="no">gnome-doc-list@gnome.org</email>
    </credit>
    <credit type="editor">
      <name>Michael Hill</name>
      <email its:translate="no">mdhillca@gmail.com</email>
    </credit>
    <credit type="editor">
      <name>Ekaterina Gerasimova</name>
      <email its:translate="no">kittykat3756@gmail.com</email>
    </credit>

    <include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>

    <desc>The screen will dim when the computer is idle in order to save power.</desc>
  </info>

  <title>Why does my screen go dim after a while?</title>

  <p>If it is possible to set the brightness of your screen, it will dim when
  the computer is idle in order to save power. When you start using the
  computer again, the screen will brighten.</p>

  <p>You can stop the screen from dimming itself:</p>

  <steps>
    <item>
      <p>Open the <gui xref="shell-terminology">Activities</gui> overview and
      start typing <gui>Power</gui>.</p>
    </item>
    <item>
      <p>Click on <gui>Power</gui> to open the panel.</p>
    </item>
    <item>
      <p>Switch <gui>Blank screen</gui> to <gui>OFF</gui> in the <gui>Power
      Saving</gui> section.</p>
    </item>
  </steps>

</page>