Patch to hal-spec : 5/6-system-display_device

[Richard Hughes]

    <sect2 id="device-properties-system-display_device">
      <title><literal>system.display_device</literal> namespace</title>
      <para>

	Device objects with the capability <literal>display_device</literal> 
        represent all display devices in the system

      </para>
      <informaltable>
        <tgroup cols="2">
          <thead>
            <row>
              <entry>Key (type)</entry>
              <entry>Values</entry>
              <entry>Mandatory</entry>
              <entry>Description</entry>
            </row>
          </thead>
          <tbody>
            <row>
              <entry><literal>system.display_device.type</literal> (string)</entry>
              <entry></entry>
              <entry>Yes</entry>
              <entry>The type of display device</entry>
            </row>
            <row>
              <entry></entry>
              <entry>lcd</entry>
              <entry></entry>
              <entry>LCD panel</entry>
            </row>
            <row>
              <entry></entry>
              <entry>crt</entry>
              <entry></entry>
              <entry>CRT tube</entry>
            </row>
            <row>
              <entry></entry>
              <entry>tv_out</entry>
              <entry></entry>
              <entry>TV Out</entry>
            </row>
            <row>
              <entry><literal>system.display_device.lcd.brightness</literal>
(int)</entry>
              <entry></entry>
              <entry>Only if <literal>system.display_device.type</literal> is
lcd</entry>
              <entry>Brightness level in percent</entry>
            </row>
          </tbody>
        </tgroup>
      </informaltable>
    </sect2>


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