Add some information about subpixel sampling on LCD displays under

XFree86 4.X.

PR:		docs/30284
Submitted by:	Rahul Siddharthan <rsidd@physics.iisc.ernet.in>

en_US.ISO8859-1/books/handbook/x11/chapter.sgml

@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO8859-1/books/handbook/x11/chapter.sgml,v 1.54 2001/09/03 07:12:23 murray Exp $
+     $FreeBSD: doc/en_US.ISO8859-1/books/handbook/x11/chapter.sgml,v 1.55 2001/09/03 23:54:59 murray Exp $
 -->
 
 <chapter id="x11">
@@ -733,6 +733,20 @@ match any family == "LuciduxMono"       edit family =+ "Lucidux Mono";</programl
         files.  To do this, add a last line:</para>
 
        <programlisting>includeif  "~/.xftconfig"</programlisting>
+
+       <para>One last point: if you are using an LCD screen, you may
+        want to enable sub-pixel sampling.  This basically treats the
+        (horizontally separated) red, green and blue components
+        separately to improve the horizontal resolution; the results can
+        be dramatic.  To enable this, add the line somewhere in your
+        XftConfig file</para>
+      
+       <programlisting>match edit rgba=rgb;</programlisting>
+      
+       <para>(depending on what sort of display you have, you may
+        need to change that last word from ``rgb'' to ``bgr'', ``vrgb''
+        or ``vbgr'': experiment and see which works best.)</para>
+
  
        <para>That's all; anti-aliasing should be enabled the next
         time you start the X server.  However, note that your programs must