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Revise HorizSync and VertRefresh suggestions, emphasizing autodetection.

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Reviewed by:	doc
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Warren Block 2012-07-05 12:41:20 +00:00
parent c11d9d32a9
commit 5a87896b27
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=39176
1 changed files with 46 additions and 38 deletions

84
en_US.ISO8859-1/books/handbook/x11/chapter.sgml
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@ -364,36 +364,47 @@
<sect2>
<title>Before Starting</title>
<para>Before configuration of X11
the following information about the target system is needed:</para>
<para>In most cases, X11 is self-configuring. Those with older
or unusual equipment may find it helpful to gather some
hardware information before beginning configuration.</para>
<itemizedlist>
<listitem><para>Monitor specifications</para></listitem>
<listitem><para>Video Adapter chipset</para></listitem>
<listitem><para>Video Adapter memory</para></listitem>
<listitem><para>Monitor sync frequencies</para></listitem>
<listitem><para>Video card chipset</para></listitem>
<listitem><para>Video card memory</para></listitem>
</itemizedlist>
<indexterm><primary>horizontal scan rate</primary></indexterm>
<indexterm><primary>vertical scan rate</primary></indexterm>
<indexterm>
<primary>horizontal sync frequency</primary>
</indexterm>
<indexterm>
<primary>horizontal scan rate</primary>
<see>horizontal sync frequency</see>
</indexterm>
<indexterm><primary>refresh rate</primary></indexterm>
<indexterm>
<primary>vertical sync frequency</primary>
<see>refresh rate</see>
</indexterm>
<indexterm>
<primary>vertical scan rate</primary>
<see>refresh rate</see>
</indexterm>
<para>The specifications for the monitor are used by
X11 to determine the resolution and
refresh rate to run at. These specifications can usually be
obtained from the documentation that came with the monitor or from
the manufacturer's website. There are two ranges of numbers that
are needed, the horizontal scan rate and the vertical synchronization
rate.</para>
<para>Screen resolution and refresh rate are determined by the
monitor's horizontal and vertical sync frequencies. Almost
all monitors support electronic autodetection of these values.
A few monitors do not provide these values, and the
specifications must be determined from the printed manual
or manufacturer web site.</para>
<para>The video adapter's chipset defines what driver module
X11 uses to talk to the graphics
hardware. With most chipsets, this can be automatically
determined, but it is still useful to know in case the automatic
detection does not work correctly.</para>
<para>The video card chipset is also autodetected, and used to
select the proper video driver. It is beneficial for the user
to be aware of which chipset is installed for when
autodetection does not provide the desired result.</para>
<para>Video memory on the graphic adapter determines the
resolution and color depth which the system can run at. This is
important to know so the user knows the limitations of the
system.</para>
<para>Video card memory determines the maximum resolution and
color depth which can be displayed.</para>
</sect2>
<sect2>
@ -584,12 +595,12 @@ dbus_enable="YES"</programlisting>
<indexterm><primary>X11 tuning</primary></indexterm>
<para>Next, tune the <filename>xorg.conf.new</filename>
configuration file to taste. Open the file in a text editor such
as &man.emacs.1; or &man.ee.1;. First, add the
frequencies for the target system's monitor. These are usually
expressed as a horizontal and vertical synchronization rate. These
values are added to the <filename>xorg.conf.new</filename> file
<para>The <filename>xorg.conf.new</filename>
configuration file may now be tuned to taste. Open the file in a text editor such
as &man.emacs.1; or &man.ee.1;. If the monitor is an older
or unusual model that does not support autodetection of
sync frequencies, those settings can
be added to <filename>xorg.conf.new</filename>
under the <literal>"Monitor"</literal> section:</para>
<programlisting>Section "Monitor"
@ -600,14 +611,11 @@ dbus_enable="YES"</programlisting>
VertRefresh 48-120
EndSection</programlisting>
<para>The <literal>HorizSync</literal> and
<literal>VertRefresh</literal> keywords may be missing in the
configuration file. If they are, they need to be added, with
the correct horizontal synchronization rate placed after the
<literal>HorizSync</literal> keyword and the vertical
synchronization rate after the <literal>VertRefresh</literal>
keyword. In the example above the target monitor's rates were
entered.</para>
<para>Most monitors support sync frequency autodetection, making
manual entry of these values unnecessary. For the few
monitors that do not support autodetection, avoid potential
damage by only entering values provided by the
manufacturer.</para>
<para>X allows DPMS (Energy Star) features to be used with capable
monitors. The &man.xset.1; program controls the time-outs and can force
@ -684,7 +692,7 @@ EndSection</programlisting>
<title>Advanced Configuration Topics</title>
<sect3>
<title>Configuration with &intel; i810 Graphics Chipsets</title>
<title>Configuration with &intel; <literal>i810</literal> Graphics Chipsets</title>
<indexterm><primary>Intel i810 graphic chipset</primary></indexterm>