Section: XScreenSaver manual (1)
Updated: 5.30 (11-Sep-2014)
The xscreensaver-demo program is a graphical front-end for setting the parameters used by the background xscreensaver?(1) daemon. It is essentially two things: a tool for editing the ~/.xscreensaver file; and a tool for demoing the various graphics hacks that the xscreensaver daemon will launch.
All of these commands are on either the File or Help menus:
Note that it is not the same as doing ``xscreensaver-command -restart''.
This page contains a list of the names of the various display modes, a preview area, and some fields that let you configure screen saver behavior.
Single-clicking in the list will run it in the small preview pane on the right. (But beware: many of the display modes behave somewhat differently when running in full-screen mode, so the scaled-down view might not give an accurate impression.)
When Mode is set to Random Screen Saver, each name in the list has a checkbox next to it: this controls whether this display mode is enabled. If it is unchecked, then that mode will not be chosen. (Though you can still run it explicitly by double-clicking on its name.)
When you click on the Settings button on the Display Modes tab, a configuration dialog will pop up that lets you customize settings of the selected display mode. Each display mode has its own custom configuration controls on the left side.
On the right side is a paragraph or two describing the display mode. Below that is a Documentation button that will display the display mode's manual page, if it has one, in a new window (since each of the display modes is actually a separate program, they each have their own manual.)
This tab lets you change various settings used by the xscreensaver daemon itself, as well as some global options shared by all of the display modes.
Some of the graphics hacks manipulate images. These settings control where those source images come from. (All of these options work by invoking the xscreensaver-getimage?(1) program, which is what actually does the work.)
If more than one of the above image-related options are selected, then one will be chosen at random. If none of them are selected, then an image of video colorbars will be used instead.
Some of the display modes display and manipulate text. The following options control how that text is generated. (These parameters control the behavior of the xscreensaver-text?(1) program, which is what actually does the work.)
Note: this re-downloads the document every time the screen saver runs out of text, so it will probably be hitting that web server multiple times a minute. Be careful that the owner of that server doesn't consider that to be abusive.
Power Management Settings
These settings control whether, and when, your monitor powers down.
If this option is grayed out, it means your X server does not support the XDPMS extension, and so control over the monitor's power state is not available.
If you're using a laptop, don't be surprised if this has no effect: many laptops have monitor power-saving behavior built in at a very low level that is invisible to Unix and X. On such systems, you can typically only adjust the power-saving delays by changing settings in the BIOS in some hardware-specific way.
Fading and Colormaps
These options control how the screen fades to or from black when a screen saver begins or ends.
There are more settings than these available, but these are the most commonly used ones; see the manual for xscreensaver?(1) for other parameters that can be set by editing the ~/.xscreensaver file, or the X resource database.
xscreensaver-demo accepts the following command line options.
It is important that the xscreensaver and xscreensaver-demo processes be running on the same machine, or at least, on two machines that share a file system. When xscreensaver-demo writes a new version of the ~/.xscreensaver file, it's important that the xscreensaver see that same file. If the two processes are seeing different ~/.xscreensaver files, things will malfunction.
The latest version of xscreensaver, an online version of this manual, and a FAQ can always be found at http://www.jwz.org/xscreensaver/
Copyright © 1992-2013 by Jamie Zawinski. Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.
Jamie Zawinski <firstname.lastname@example.org>, 13-aug-92.
Please let me know if you find any bugs or make any improvements.
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