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  1. <chapter id="performance-0">
  2.   <title>Improving Performance</title>
  3.   <highlights>
  4.     <para>This chapter describes how to improve the performance of
  5. the GNOME Desktop.</para>
  6.   </highlights>
  7.   <sect1 id="performance-1">
  8.     <title>Introduction to Improving Performance</title>
  9.     <indexterm>
  10.       <primary>performance, improving</primary>
  11.       <secondary>introduction</secondary>
  12.     </indexterm>
  13.     <para>This chapter lists several preferences whose
  14. settings you can change to improve the performance of the GNOME Desktop. You
  15. can use the <command>gconftool-2</command> command to set values for preferences
  16. for users. The example commands in this chapter show how to set values in
  17. the user configuration source.</para>
  18.     <para>You can also use the <literal>--direct</literal> and <literal>--config-source</literal> options to set mandatory values or default values for preferences.
  19. You can also use the <command>gconftool-2</command> command in a script to
  20. set the values of many preferences. For more information on the  <command>gconftool-2</command> command and the options that are  available with the
  21. command, see <xref linkend="gconf-0"/>.</para>
  22.   </sect1>
  23.   <sect1 id="performance-8">
  24.     <title>Reducing CPU Usage</title>
  25.     <indexterm>
  26.       <primary>performance, improving</primary>
  27.       <secondary>reducing CPU
  28. usage</secondary>
  29.     </indexterm>
  30.     <indexterm>
  31.       <primary>reducing</primary>
  32.       <secondary>CPU usage</secondary>
  33.     </indexterm>
  34.     <indexterm>
  35.       <primary>CPU usage</primary>
  36.       <secondary>reducing</secondary>
  37.     </indexterm>
  38.     <para>This section describes preferences that
  39. you can set to reduce CPU usage by the GNOME Desktop. </para>
  40.     <sect2 id="performance-3">
  41.       <title>To Use Theme Options Which Require Less CPU Resources</title>
  42.       <indexterm>
  43.         <primary>themes</primary>
  44.         <secondary>window frame options</secondary>
  45.         <tertiary>and CPU usage</tertiary>
  46.       </indexterm>
  47.       <indexterm>
  48.         <primary>themes</primary>
  49.         <secondary>and CPU usage</secondary>
  50.       </indexterm>
  51.       <para>Some window frame theme
  52. options load image files to draw the window frame. Other options use simpler
  53. techniques to draw the window frame.</para>
  54.       <para>The Crux window frame option loads image files, and can be slow on systems
  55. with limited CPU resources. To reduce CPU usage, use one of the following
  56. window frame options: </para>
  57.       <itemizedlist>
  58.         <listitem>
  59.           <para>Atlanta</para>
  60.         </listitem>
  61.         <listitem>
  62.           <para>Esco</para>
  63.         </listitem>
  64.       </itemizedlist>
  65.       <para>The following window frame options also use less CPU resources than
  66. Crux:</para>
  67.       <itemizedlist>
  68.         <listitem>
  69.           <para>AgingGorilla</para>
  70.         </listitem>
  71.         <listitem>
  72.           <para>Bright</para>
  73.         </listitem>
  74.         <listitem>
  75.           <para>Metabox</para>
  76.         </listitem>
  77.       </itemizedlist>
  78.       <note>
  79.         <para>Metabox does not work well with inverse controls options such
  80. as HighContrastInverse. Use Atlanta with inverse controls options.</para>
  81.       </note>
  82.       <para><indexterm><primary>themes</primary><secondary>window frame options</secondary><tertiary>changing</tertiary></indexterm>To change the window
  83. frame theme option, run the following command: </para>
  84.       <screen><userinput>gconftool-2 \
  85. --type string \
  86. --set /apps/metacity/general/theme <replaceable>option-name</replaceable></userinput></screen>
  87.       <para>For example, to use Atlanta, run the following command:</para>
  88.       <screen><userinput>gconftool-2 \
  89. --type string \
  90. --set /apps/metacity/general/theme Atlanta</userinput></screen>
  91.       <para>Alternatively, users can use the <application>Theme</application> preference
  92. tool to select the appropriate option.</para>
  93.       <tip>
  94.         <para>You can use the <application>Metacity Theme Viewer</application>
  95. to measure the performance of a window frame option, and to preview the option.
  96. To start <application>Metacity Theme Viewer</application>, use the following
  97. command:</para>
  98.         <screen><userinput>metacity-theme-viewer <replaceable>option-name</replaceable></userinput></screen>
  99.         <para>For example, to measure the performance of Atlanta and preview Atlanta,
  100. run the following command: </para>
  101.         <screen><userinput>metacity-theme-viewer Atlanta</userinput></screen>
  102.       </tip>
  103.     </sect2>
  104.     <sect2 id="performance-2">
  105.       <title>To Reduce CPU Usage by Turning Off Display of Icons in Menus</title>
  106.       <indexterm>
  107.         <primary>icons, in menus</primary>
  108.         <see>menu icons</see>
  109.       </indexterm>
  110.       <indexterm>
  111.         <primary>menu icons</primary>
  112.         <secondary>and CPU usage</secondary>
  113.       </indexterm>
  114.       <indexterm>
  115.         <primary>menu icons</primary>
  116.         <secondary>turning off</secondary>
  117.       </indexterm>
  118.       <para>Some items in menus display an icon beside the
  119. item. To turn off this feature, run the following command: </para>
  120.       <screen><userinput>gconftool-2 \
  121. --type bool \
  122. --set /desktop/gnome/interface/menus_have_icons false</userinput></screen>
  123.       <para>Alternatively, users can use the <application>Menus & Toolbars</application>
  124. preference tool to deselect the <guilabel>Show icons in menus</guilabel> option.</para>
  125.     </sect2>
  126.     <sect2 id="performance-6">
  127.       <title>To Reduce CPU Usage by Turning Off the Splash Screen</title>
  128.       <indexterm>
  129.         <primary>splash screen</primary>
  130.         <secondary>and CPU usage</secondary>
  131.       </indexterm>
  132.       <para>By default, when users log in to the desktop environment,
  133. a splash screen is displayed. Icons are displayed on the splash screen while
  134. the user logs in. You can turn off the splash screen to reduce CPU usage during
  135. login. </para>
  136.       <para><indexterm><primary>splash screen</primary><secondary>turning off</secondary></indexterm>To turn off the splash screen, run the following command:</para>
  137.       <screen><userinput>gconftool-2 \
  138. --type bool \
  139. --set /apps/gnome-session/options/show_splash_screen false</userinput></screen>
  140.       <para>Alternatively, users can use the <application>Sessions</application>
  141. preference tool to deselect the <guilabel>Show splash screen on login</guilabel>
  142. option.</para>
  143.     </sect2>
  144.     <sect2 id="performance-4">
  145.       <title>To Reduce CPU Usage by Turning Off Panel Animation</title>
  146.       <indexterm>
  147.         <primary>panels</primary>
  148.         <secondary>animation, turning off</secondary>
  149.       </indexterm>
  150.       <para>When users show or hide panels, the panels can show or hide
  151. in an animated style. To turn off panel animation, run the following command: </para>
  152.       <screen><userinput>gconftool-2 \
  153. --type bool \
  154. --set /apps/panel/global/enable_animations false</userinput></screen>
  155.       <para>Alternatively, users can use the <application>Panel</application> preference
  156. tool to deselect the <guilabel>Drawer and panel animation</guilabel> option.</para>
  157.     </sect2>
  158.     <sect2 id="performance-7">
  159.       <title>Improving File Manager Performance</title>
  160.       <indexterm>
  161.         <primary>Nautilus</primary>
  162.         <see>file manager</see>
  163.       </indexterm>
  164.       <para>The <application>Nautilus</application> file manager includes some features
  165. that you can modify to improve performance.</para>
  166.       <sect3 id="performance-9">
  167.         <title>To Modify Performance Preferences</title>
  168.         <indexterm>
  169.           <primary>file manager</primary>
  170.           <secondary>modifying performance
  171. preferences</secondary>
  172.         </indexterm>
  173.         <para>The file manager includes performance-related
  174. preferences. Each performance preference can take one of three values. The
  175. values are described in the following table:</para>
  176.         <informaltable frame="topbot">
  177.           <tgroup cols="2" colsep="0" rowsep="0">
  178.             <colspec colwidth="34.46*"/>
  179.             <colspec colwidth="65.54*"/>
  180.             <thead>
  181.               <row rowsep="1">
  182.                 <entry>
  183.                   <para>Value</para>
  184.                 </entry>
  185.                 <entry>
  186.                   <para>Description</para>
  187.                 </entry>
  188.               </row>
  189.             </thead>
  190.             <tbody>
  191.               <row>
  192.                 <entry valign="top">
  193.                   <para>
  194.                     <literal>always</literal>
  195.                   </para>
  196.                 </entry>
  197.                 <entry valign="top">
  198.                   <para>Performs the action for both local files, and files on
  199. other file systems.</para>
  200.                 </entry>
  201.               </row>
  202.               <row>
  203.                 <entry valign="top">
  204.                   <para>
  205.                     <literal>local_only</literal>
  206.                   </para>
  207.                 </entry>
  208.                 <entry valign="top">
  209.                   <para>Performs the action for local files only. When you
  210. set a performance preference to <literal>local_only</literal>, the CPU usage
  211. is reduced.</para>
  212.                 </entry>
  213.               </row>
  214.               <row>
  215.                 <entry valign="top">
  216.                   <para>
  217.                     <literal>never</literal>
  218.                   </para>
  219.                 </entry>
  220.                 <entry valign="top">
  221.                   <para>Never performs the action. When you set a performance preference
  222. to never, the CPU usage and the network traffic are reduced.</para>
  223.                 </entry>
  224.               </row>
  225.             </tbody>
  226.           </tgroup>
  227.         </informaltable>
  228.         <para>The following table describes the performance preferences for the file
  229. manager. For the fastest performance, set the value of the preferences to <literal>never</literal>.</para>
  230.         <informaltable frame="topbot">
  231.           <tgroup cols="2" colsep="0" rowsep="0">
  232.             <colspec colwidth="43.34*"/>
  233.             <colspec colwidth="56.66*"/>
  234.             <thead>
  235.               <row rowsep="1">
  236.                 <entry>
  237.                   <para>Preference</para>
  238.                 </entry>
  239.                 <entry>
  240.                   <para>Description</para>
  241.                 </entry>
  242.               </row>
  243.             </thead>
  244.             <tbody>
  245.               <row>
  246.                 <entry valign="top">
  247.                   <para>
  248.                     <literal>show_icon_text</literal>
  249.                   </para>
  250.                 </entry>
  251.                 <entry valign="top">
  252.                   <para>Specifies when to preview the content of text files
  253. in the icon that represents the file. To never preview the content of text
  254. files, run the following command: </para>
  255.                   <screen><userinput>gconftool-2 \
  256. --type string \
  257. --set /apps/nautilus/preferences/show_icon_text never</userinput></screen>
  258.                   <para>Alternatively, users can perform
  259. the following steps:</para>
  260.                   <orderedlist>
  261.                     <listitem>
  262.                       <para>Choose <menuchoice><guimenu>Edit</guimenu><guimenuitem>Preferences</guimenuitem></menuchoice> from a file manager window, then choose <guilabel>Preview</guilabel>.</para>
  263.                     </listitem>
  264.                     <listitem>
  265.                       <para>Select an option for the <guilabel>Show text in icons</guilabel>
  266. preference.</para>
  267.                     </listitem>
  268.                   </orderedlist>
  269.                 </entry>
  270.               </row>
  271.               <row>
  272.                 <entry valign="top">
  273.                   <para>
  274.                     <literal>show_directory_item_counts</literal>
  275.                   </para>
  276.                 </entry>
  277.                 <entry valign="top">
  278.                   <para>Specifies when to show the number of items in folders.
  279. To never show the number of items in folders, run the following command:</para>
  280.                   <screen><userinput>gconftool-2 \
  281. --type string \
  282. --set /apps/nautilus/preferences/show_directory_item_counts never</userinput></screen>
  283.                   <para>Alternatively, users can perform the following steps:</para>
  284.                   <orderedlist>
  285.                     <listitem>
  286.                       <para>Choose <menuchoice><guimenu>Edit</guimenu><guimenuitem>Preferences</guimenuitem></menuchoice> from a file manager window, then choose <guilabel>Preview</guilabel>.</para>
  287.                     </listitem>
  288.                     <listitem>
  289.                       <para>Select an option for the <guilabel>Count number of items</guilabel>
  290. preference.</para>
  291.                     </listitem>
  292.                   </orderedlist>
  293.                 </entry>
  294.               </row>
  295.               <row>
  296.                 <entry valign="top">
  297.                   <para>
  298.                     <literal>show_image_thumbnails</literal>
  299.                   </para>
  300.                 </entry>
  301.                 <entry valign="top">
  302.                   <para>Specifies when to show thumbnails of image files.
  303. To never show thumbnails, run the following command:</para>
  304.                   <screen><userinput>gconftool-2 \
  305. --type string \
  306. --set /apps/nautilus/preferences/show_image_thumbnails never</userinput></screen>
  307.                   <para>Alternatively, users can perform the following steps:</para>
  308.                   <orderedlist>
  309.                     <listitem>
  310.                       <para>Choose <menuchoice><guimenu>Edit</guimenu><guimenuitem>Preferences</guimenuitem></menuchoice> from a file manager window, then choose <guilabel>Preview</guilabel>.</para>
  311.                     </listitem>
  312.                     <listitem>
  313.                       <para>Select an option for the <guilabel>Show thumbnails</guilabel>
  314. preference.</para>
  315.                     </listitem>
  316.                   </orderedlist>
  317.                 </entry>
  318.               </row>
  319.               <row>
  320.                 <entry valign="top">
  321.                   <para>
  322.                     <literal>preview_sound</literal>
  323.                   </para>
  324.                 </entry>
  325.                 <entry valign="top">
  326.                   <para>Specifies when to preview the content of sound files.
  327. To never preview the content of sound files, run the following command:</para>
  328.                   <screen><userinput>gconftool-2 \
  329. --type string \
  330. --set /apps/nautilus/preferences/preview_sound never</userinput></screen>
  331.                   <para>Alternatively, users can perform the following
  332. steps:</para>
  333.                   <orderedlist>
  334.                     <listitem>
  335.                       <para>Choose <menuchoice><guimenu>Edit</guimenu><guimenuitem>Preferences</guimenuitem></menuchoice> from a file manager window, then choose <guilabel>Preview</guilabel>.</para>
  336.                     </listitem>
  337.                     <listitem>
  338.                       <para>Select an option for the <guilabel>Preview sound files</guilabel>
  339. preference.</para>
  340.                     </listitem>
  341.                   </orderedlist>
  342.                 </entry>
  343.               </row>
  344.             </tbody>
  345.           </tgroup>
  346.         </informaltable>
  347.       </sect3>
  348.       <sect3 id="performance-10">
  349.         <title>To Turn Off the Side Pane, Toolbar, and Location Bar</title>
  350.         <indexterm>
  351.           <primary>file manager</primary>
  352.           <secondary>side pane, turning off</secondary>
  353.         </indexterm>
  354.         <para>The file manager includes preferences that enable
  355. you to turn off the side pane and the toolbar. To improve file manager performance,
  356. turn off the side pane and the toolbar.</para>
  357.         <para>To turn off the side pane, run the following command: </para>
  358.         <screen><userinput>gconftool-2 \
  359. --type bool \
  360. --set /apps/nautilus/preferences/start_with_sidebar false</userinput></screen>
  361.         <para><indexterm><primary>file manager</primary><secondary>toolbar, turning
  362. off</secondary></indexterm>To turn off the toolbar, run the following command: </para>
  363.         <screen><userinput>gconftool-2 \
  364. --type bool \
  365. --set /apps/nautilus/preferences/start_with_toolbar false</userinput></screen>
  366.         <para>You can also turn off the location bar. Users can use the <keycombo><keycap>Ctrl</keycap><keycap>L</keycap></keycombo> keyboard shortcut to display a location bar
  367. when required.  </para>
  368.         <para><indexterm><primary>file manager</primary><secondary>location bar, turning
  369. off</secondary></indexterm>To turn off the location bar, run the following
  370. command:</para>
  371.         <screen><userinput>gconftool-2 \
  372. --type bool \
  373. --set /apps/nautilus/preferences/start_with_location_bar false</userinput></screen>
  374.       </sect3>
  375.       <sect3 id="performance-11">
  376.         <title>To Turn Off the Desktop</title>
  377.         <indexterm>
  378.           <primary>file manager</primary>
  379.           <secondary>desktop, turning off</secondary>
  380.         </indexterm>
  381.         <indexterm>
  382.           <primary>desktop</primary>
  383.           <secondary>turning
  384. off</secondary>
  385.         </indexterm>
  386.         <para>The file manager contains a preference that
  387. enables users to use <application>Nautilus</application> to manage the desktop.
  388. You can disable the desktop to improve performance. However, if you disable
  389. the desktop, you cannot do the following:</para>
  390.         <itemizedlist>
  391.           <listitem>
  392.             <para>Use the file manager to change the pattern or color of the
  393. desktop background. </para>
  394.           </listitem>
  395.           <listitem>
  396.             <para>Use the desktop objects, such as <guilabel>Trash</guilabel>.
  397. The desktop objects are not displayed on the desktop. </para>
  398.           </listitem>
  399.         </itemizedlist>
  400.         <para>To disable the desktop, run the following command: </para>
  401.         <screen><userinput>gconftool-2 \
  402. --type bool \
  403. --set /apps/nautilus/preferences/show_desktop false</userinput></screen>
  404.       </sect3>
  405.     </sect2>
  406.   </sect1>
  407.   <sect1 id="performance-12">
  408.     <title>Reducing X Window System Network Traffic</title>
  409.     <indexterm>
  410.       <primary>reducing</primary>
  411.       <secondary>X Window System network traffic</secondary>
  412.     </indexterm>
  413.     <indexterm>
  414.       <primary>X Window System network traffic,
  415. reducing</primary>
  416.     </indexterm>
  417.     <indexterm>
  418.       <primary>network traffic, reducing</primary>
  419.     </indexterm>
  420.     <para>This section describes preferences that you can
  421. set to reduce X Window System network traffic on the GNOME Desktop. </para>
  422.     <sect2 id="performance-14">
  423.       <title>To Use Theme Options Which Create Less Network Traffic</title>
  424.       <indexterm>
  425.         <primary>themes</primary>
  426.         <secondary>window frame options</secondary>
  427.         <tertiary>and network traffic</tertiary>
  428.       </indexterm>
  429.       <indexterm>
  430.         <primary>themes</primary>
  431.         <secondary>and network traffic</secondary>
  432.       </indexterm>
  433.       <para>Remote
  434. display protocols do not transfer every pixel in a block of pixels if all
  435. pixels in the block are the same color.</para>
  436.       <para>To reduce X Window System network traffic, use a window frame theme
  437. option that uses solid colors. That is, use one of the following window frame
  438. options:</para>
  439.       <itemizedlist>
  440.         <listitem>
  441.           <para>Atlanta</para>
  442.         </listitem>
  443.         <listitem>
  444.           <para>Esco</para>
  445.         </listitem>
  446.       </itemizedlist>
  447.       <para>For information on how to change theme options, see <xref linkend="performance-3"/>.</para>
  448.     </sect2>
  449.     <sect2 id="performance-15">
  450.       <title>To Reduce Network Traffic by Turning Off Display of Icons in Menus</title>
  451.       <indexterm>
  452.         <primary>menu icons</primary>
  453.         <secondary>and network traffic</secondary>
  454.       </indexterm>
  455.       <para>Some items in menus display an icon beside the item. If
  456. the icon is located on another file system, this feature can increase X Window
  457. System network traffic. This feature can also increase X Window System network
  458. traffic if the panels are displayed on a remote host. </para>
  459.       <para>For information on how to turn off this feature, see <xref linkend="performance-2"/>.</para>
  460.     </sect2>
  461.   </sect1>
  462.   <sect1 id="performance-17">
  463.     <title>Reducing Color Usage and Improving Display Quality</title>
  464.     <indexterm>
  465.       <primary>reducing</primary>
  466.       <secondary>color usage</secondary>
  467.     </indexterm>
  468.     <indexterm>
  469.       <primary>color usage</primary>
  470.       <secondary>reducing</secondary>
  471.     </indexterm>
  472.     <indexterm>
  473.       <primary>display quality, improving</primary>
  474.     </indexterm>
  475.     <para>Many modern computer systems support 24-bit color, that is, 16,777,216 colors.
  476. However, many users still use systems that support 8-bit color, that is, 256
  477. colors. </para>
  478.     <para>The GNOME Desktop uses the <firstterm>websafe color palette</firstterm>.
  479. This palette is a general-purpose palette of 216 colors, which is designed
  480. to optimize the use of color on systems that support 8-bit color. However,
  481. some visual components of the GNOME Desktop are designed for systems that
  482. support 24-bit color.</para>
  483.     <para>The following display problems might occur on systems that support 8-bit
  484. color:</para>
  485.     <itemizedlist>
  486.       <listitem>
  487.         <para>Windows, icons, and background images might appear grainy.
  488.  Many themes, background images, and icons use colors that are not in the
  489. websafe color palette. The colors that are not in the palette are replaced
  490. with the nearest equivalent or a dithered approximation. This use of replacement
  491. colors causes the grainy appearance.</para>
  492.       </listitem>
  493.       <listitem>
  494.         <para>Applications that do not use the websafe color palette have
  495. less colors available. Color errors might occur. Some colors might not appear
  496. in the user interface of the application. Some applications might crash if
  497. the application cannot allocate colors.</para>
  498.       </listitem>
  499.       <listitem>
  500.         <para>Color flashing might occur when users switch between applications
  501. that use the websafe color palette, and applications that do not use this
  502. palette. The applications that do not use the websafe color palette might
  503. use a custom colormap. When the custom colormap is used, other visual components
  504. might lose colors, then become unviewable.</para>
  505.       </listitem>
  506.     </itemizedlist>
  507.     <para>The following sections describe how to optimize the appearance of the
  508. GNOME Desktop for systems that support 8-bit color. </para>
  509.     <sect2 id="performance-20">
  510.       <title>To Use Theme Options That Use the Websafe Color Palette</title>
  511.       <indexterm>
  512.         <primary>themes</primary>
  513.         <secondary>window frame options</secondary>
  514.         <tertiary>and color usage</tertiary>
  515.       </indexterm>
  516.       <indexterm>
  517.         <primary>themes</primary>
  518.         <secondary>and color usage</secondary>
  519.       </indexterm>
  520.       <para>Some window
  521. frame theme options use colors that are in the websafe color palette. Bright
  522. and Esco use colors from the websafe color palette. Bright and Esco do not
  523. have the grainy appearance of other window frame options on 8-bit color displays.
  524. Use Bright or Esco for the best color display on 8-bit visual modes. </para>
  525.       <para>For information on how to change theme options, see <xref linkend="performance-3"/>.</para>
  526.     </sect2>
  527.     <sect2 id="performance-21">
  528.       <title>To Reduce Color Usage by Turning Off Display of Icons in Menus</title>
  529.       <indexterm>
  530.         <primary>menu icons</primary>
  531.         <secondary>and color usage</secondary>
  532.       </indexterm>
  533.       <para>Some items in menus display an icon beside the item. If
  534. the icon contains colors that are not in the websafe color palette, this feature
  535. can increase the number of colors used.</para>
  536.       <para>For information on how to turn off this feature, see <xref linkend="performance-2"/>.</para>
  537.     </sect2>
  538.     <sect2 id="performance-18">
  539.       <title>To Reduce Color Usage by Turning Off the Splash Screen</title>
  540.       <indexterm>
  541.         <primary>splash screen</primary>
  542.         <secondary>and color usage</secondary>
  543.       </indexterm>
  544.       <para>You can turn off the splash screen to make more colors available
  545. for the GNOME Desktop and for applications.</para>
  546.       <para>For information on how to turn off the splash screen, see <xref linkend="performance-6"/>.</para>
  547.     </sect2>
  548.     <sect2 id="performance-19">
  549.       <title>To Reduce Color Usage by Using a Solid Color for the Background</title>
  550.       <indexterm>
  551.         <primary>background</primary>
  552.         <secondary>using solid color</secondary>
  553.       </indexterm>
  554.       <para>Use a solid color for the desktop background. Use of a solid
  555. color reduces the number of colors used by the GNOME Desktop. </para>
  556.       <para>To set a solid color for the background, run the following commands: </para>
  557.       <screen><userinput>gconftool-2 \
  558. --type string \
  559. --set /desktop/gnome/background/picture_options none</userinput></screen>
  560.       <screen><userinput>gconftool-2 \
  561. --type string \
  562. --set /desktop/gnome/background/color_shading_type solid</userinput></screen>
  563.       <screen><userinput>gconftool-2 \
  564. --type string \
  565. --set /desktop/gnome/background/primary_color #<replaceable>hexadecimal-color</replaceable></userinput></screen>
  566.       <para>Alternatively, users can use the <application>Background</application>
  567. preference tool to choose a solid color for the background.</para>
  568.     </sect2>
  569.   </sect1>
  570. </chapter>
  571.