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.
A screensaver is an application that
replaces the image on a screen when the screen is not in use. The screensaver
application for the Java Desktop System is XScreenSaver
.
The following sections describe how to set preferences for the XScreenSaver
application, and how to modify the displays that
are available for the screensaver.
Default screensaver preferences are stored in a file that is called XScreenSaver. This file is stored in different locations, depending on your operating environment, as shown in the following table:
Operating Environment |
File Location |
---|---|
Linux |
/usr/X11R6/lib/X11/app-defaults/XScreenSaver |
Solaris |
/usr/openwin/lib/app-defaults/XScreenSaver |
To modify screensaver application preferences, users can use the Screensaver
preference tool. When a user modifies the screensaver
preferences, the preferences are stored in the home directory of the user,
in the $HOME/.xscreensaver file. For information about
screensaver preferences, see the latest version of the Java Desktop
System Release 2 User Guide.
Users can also run a command to start the Screensaver
preference tool. The command that you use depends on your operating environment,
as shown in the following table:
Operating Environment |
Command |
---|---|
Linux |
/usr/bin/xscreensaver-demo |
Solaris |
/usr/openwin/bin/xscreensaver-demo |
To set default screensaver preferences for all users, modify the XScreenSaver file. You can also use the XScreenSaver dialog to create a $HOME/.xscreensaver file, then copy the file to the location of the XScreenSaver file.
To restore the default settings for a user, delete the $HOME/.xscreensaver file from the home directory of the user. If no $HOME/.xscreensaver file is present, the default preferences in the XScreenSaver file are used.
The default display behavior of XScreenSaver
is to display a blank screen. The blank screen might confuse users. You might
want to change this default display behavior.
To activate changes to the screensaver preferences, use the following command to reload screensaver preferences:
# xscreensaver-command -restart
The xset
application does not work
with XScreenSaver
at the time of publication of
this guide. To modify screensaver preferences, modify the XScreenSaver file or the $HOME/.xscreensaver file.
The screensaver application allows users to choose one or more screensaver displays. 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 XScreenSaver file and in the $HOME/.xscreensaver file.
To add a new screensaver display, copy the executable file for the display to the directory where the displays are located. For example, in Java Desktop System, the displays are located in the /usr/lib/xscreensaver directory. Add the command for the screensaver display to the XScreenSaver file or the $HOME/.xscreensaver file. Include any arguments that are required to run the screensaver display on the whole screen, rather than in a window. For example, you might want to include the -root option to display the screensaver display on the whole screen.
To add a new screensaver display, copy the executable file for the display to the /usr/openwin/lib/xscreensaver/hacks directory. Add the command for the screensaver display to the XScreenSaver file or the $HOME/.xscreensaver file. Include any arguments that are required to run the screensaver display on the whole screen, rather than in a window. For example, you might want to include the -root option to display the screensaver display on the whole screen.
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 $HOME/.xscreensaver file shows a disabled Qix (solid) screensaver display:
- "Qix (solid)" qix -root -solid -segments 100
To disable screensaver displays for all users on a Sun Ray™ thin client, rename the /usr/openwin/lib/xscreensaver/hacks directory to any name other than hacks.
OpenGL
screensaver displays are provided
with the GNOME Desktop. By default, all OpenGL
screensaver displays are disabled, because many users do not have the OpenGL
library installed. Users who have the OpenGL
library installed can use the XScreenSaver
dialog to enable OpenGL
screensaver displays.
Some screensaver displays show the contents of the screen of the user. To avoid security violations, screensaver displays that show the contents of the screen are not included in the Sun Microsystems distribution of the GNOME Desktop.
The Pluggable Authentication Modules (PAM)
service name for the XScreenSaver
application is dtsession. This name is used to be compatible with previous applications.