update user's guide

docs/lcdproc-user/drivers/mtc_s16209x.docbook

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+<sect1 id="mtc_s16209x-howto">
+<title>The mtc_s16209x Driver</title>
+
+<para>
+This section talks about using LCDproc with LCD displays that use the
+mtc_s16209x chipset.
+</para>
+
+<!-- ## MTC-S16209x driver ## -->
+<sect2 id="mtc_s16209x-config">
+<title>Configuration in LCDd.conf</title>
+
+<sect3>
+<title>[mtc_s16209x]</title>
+
+<variablelist>
+<varlistentry>
+  <term>
+    <command>Device=</command>
+    <arg choice="plain"><replaceable>DEVICE</replaceable></arg>
+  </term>
+  <listitem><para>
+    Select the output device to use [default: <filename>/dev/lcd</filename>]
+  </para></listitem>
+</varlistentry>
+
+<varlistentry>
+  <term>
+    <command>Brightness=</command>
+    <arg choice="plain"><replaceable>BRIGHTNESS</replaceable></arg>
+  </term>
+  <listitem><para>
+    Set the initial brightness [default: 255; legal: 0 - 255]
+  </para></listitem>
+</varlistentry>
+
+<varlistentry>
+  <term>
+    <command>Reboot=</command>
+    <arg choice="plain">
+    <group choice="req">
+      <arg choice="plain"><literal>yes</literal></arg>
+      <arg choice="plain"><literal><emphasis>no</emphasis></literal></arg>
+    </group>
+    </arg>
+  </term>
+  <listitem><para>
+    Reinitialize the LCD's BIOS [default: no; legal: yes, no]
+  </para></listitem>
+</varlistentry>
+</variablelist>
+
+</sect3>
+
+</sect2>
+
+</sect1>