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<?xml version="1.0" encoding="utf-8"?>
<chapter id="screensavers-0">
<title>Setting Screensavers</title>
<highlights>
<para>This chapter describes how to set preferences for the screensaver.
This chapter also provides information on how to modify the displays that
are available for the screensaver.</para>
</highlights>
<sect1 id="screensavers-1">
<title>Introduction</title>
<indexterm>
<primary>screensavers</primary>
<secondary>introduction</secondary>
</indexterm>
<indexterm>
<primary>XScreenSaver</primary>
<see>screensavers</see>
</indexterm>
<para>A <firstterm>screensaver</firstterm> is an application that
replaces the image on a screen when the screen is not in use. The screensaver
application for the GNOME desktop is <application>XScreenSaver</application>.
The following sections describe how to set preferences for the <application>XScreenSaver</application> application, and how to modify the displays that
are available for the screensaver.</para>
<note>
<para>The <application>XScreenSaver</application> application does not
allow you to lock your screen if you are logged in as <literal>root</literal>.
If you want to be able to lock your screen, log in as a normal user. To obtain
system administrator privileges, open a terminal window, then use the <command>su</command> command to log in as <literal>root</literal>.</para>
</note>
</sect1>
<sect1 id="screensavers-2">
<title>Setting Screensaver Preferences</title>
<indexterm>
<primary>screensavers</primary>
<secondary>setting preferences</secondary>
</indexterm>
<para>Default screensaver preferences are stored in a file that
is called <filename>XScreenSaver</filename>. This file is stored in different
locations, depending on the platform, as follows:</para>
<informaltable frame="topbot">
<tgroup cols="2" colsep="0" rowsep="0">
<colspec colwidth="43.76*"/>
<colspec colwidth="56.24*"/>
<thead>
<row rowsep="1">
<entry valign="top">
<para>Platform</para>
</entry>
<entry valign="top">
<para>File Location</para>
</entry>
</row>
</thead>
<tbody>
<row>
<entry valign="top">
<para>RedHat Linux</para>
</entry>
<entry valign="top">
<para>
<filename>/usr/X11R6/lib/X11/app-defaults/XScreenSaver</filename>
</para>
</entry>
</row>
<row>
<entry valign="top">
<para>Solaris Operating Environment</para>
</entry>
<entry valign="top">
<para>
<filename>/usr/openwin/lib/app-defaults/XScreenSaver</filename>
</para>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<para>To modify screensaver application preferences, users can right-click
on the <guibutton>Lock</guibutton> button, then choose <guimenuitem>Properties</guimenuitem>. The user can then modify preferences in the <guilabel>XScreenSaver</guilabel> dialog. When a user modifies the screensaver preferences, the
preferences are stored in the home directory of the user, in the <filename>$HOME/.xscreensaver</filename> file. For information on screensaver preferences,
see <citetitle>GNOME 2.2 Desktop User Guide</citetitle>.</para>
<para>Users can also run the command <command>/usr/X11R6/bin/xscreensaver-demo</command> to open the <guilabel>XScreenSaver</guilabel> dialog.</para>
<para>To set default screensaver preferences for all users, modify the <filename>XScreenSaver</filename> file. You can also use the <guilabel>XScreenSaver</guilabel> dialog to create a <filename>$HOME/.xscreensaver</filename> file,
then copy the file to the location of the <filename>XScreenSaver</filename>
file.</para>
<para>To restore the default settings for a user, delete the <filename>$HOME/.xscreensaver</filename> file from the home directory of the user. If no <filename>$HOME/.xscreensaver</filename> file is present, the default preferences in the <filename>XScreenSaver</filename> file are used. </para>
<note>
<para>The default display behavior of <application>XScreenSaver</application>
is to display a blank screen. The blank screen might confuse users. You might
want to change this default display behavior.</para>
</note>
<para>To activate changes to the screensaver preferences, use the following
command to reload screensaver preferences:</para>
<para><computeroutput>#</computeroutput> <userinput>xscreensaver-command -restart</userinput></para>
<note>
<para>The <application>xset</application> application does not work
with <application>XScreenSaver</application> at the time of publication of
this guide. To modify screensaver preferences, modify the <filename>XScreenSaver</filename> file or the <filename>$HOME/.xscreensaver</filename> file. </para>
</note>
</sect1>
<sect1 id="screensavers-3">
<title>Modifying Screensaver Displays</title>
<indexterm>
<primary>screensavers</primary>
<secondary>modifying screensaver
displays</secondary>
</indexterm>
<para>The screensaver application allows users
to choose one or more <firstterm>screensaver displays</firstterm>. A screensaver
display is an application that displays images on the screen of the user when
the screen is not in use. The screensaver displays are listed in the <filename>XScreenSaver</filename> file and in the <filename>$HOME/.xscreensaver</filename>
file. </para>
<para>To add a new screensaver display, copy the executable file for the display
to the <filename>/usr/X11R6/lib/xscreensaver/hacks</filename> directory. Add
the command for the screensaver display to the <filename>XScreenSaver</filename> file or the <filename>$HOME/.xscreensaver</filename> file. Include
any arguments that are required to run the screensaver display on the whole
desktop, rather than in a window. For example, you might want to include the <literal>-root</literal> option to display the screensaver display on the desktop.</para>
<para>To disable a screensaver display, add
a minus sign (-) at the start of the command for the screensaver display in
the preferences file. The following excerpt from a <filename>$HOME/.xscreensaver</filename> file shows a disabled <literal>Qix (solid)</literal> screensaver
display:</para>
<literallayout>- "Qix (solid)" qix -root -solid -segments 100</literallayout>
</sect1>
</chapter>
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