Remove pre-2.2 mouse synchronization error info.

This question could use some expansion for a 5.X world.

en_US.ISO8859-1/books/faq/book.sgml

@@ -7697,33 +7697,8 @@ ttyvb   "/usr/libexec/getty Pc"         cons25  off secure</programlisting>
           <para>Your mouse and the mouse driver may have somewhat become
             out of synchronization.</para>
 
-          <para>In versions 2.2.5 and earlier, switching away from X to a
-            virtual terminal and getting back to X again may make them
-            re-synchronized.  If the problem occurs often, you may add the
-            following option in your kernel configuration file and
-            recompile it.</para>
-
-          <programlisting>options PSM_CHECKSYNC</programlisting>
-
-          <para>See the section on <link linkend="make-kernel">building
-            a kernel</link> if you have no experience with building
-            kernels.</para>
-
-          <para>With this option, there should be less chance of
-            synchronization problems between the mouse and the driver.
-            If, however, you still see the problem, click any mouse
-            button while holding the mouse still to re-synchronize the
-            mouse and the driver.</para>
-
-          <para>Note that unfortunately this option may not work with all
-            the systems and voids the <quote>tap</quote> feature of the
-            ALPS GlidePoint device attached to the PS/2 mouse port.</para>
-
-          <para>In versions 2.2.6 and later, synchronization check is done
-            in a slightly better way and is standard in the PS/2 mouse
-            driver. It should even work with GlidePoint. (As the check code
-            has become a standard feature, PSM_CHECKSYNC option is not
-            available in these versions.) However, in rare cases the driver
+          <para>
+            In rare cases the driver
             may erroneously report synchronization problem and you may see
             the kernel message:</para>