xscreensaver-demo man page on DigitalUNIX
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XScreenSaver(1) XScreenSaver(1)
NAME
xscreensaver-demo - interactively control the background xscreensaver
daemon
SYNOPSIS
xscreensaver-demo [-display host:display.screen] [-prefs] [-xrm
resources]
DESCRIPTION
The xscreensaver-demo program is a graphical front-end for setting the
parameters used by the background xscreensaver(1) daemon. It is essen‐
tially two things: a tool for editing the ~/.xscreensaver file; and a
tool for demoing the various graphics hacks that the xscreensaver dae‐
mon will launch.
The main window consists of a menu bar and two tabbed pages. The first
page is for editing the list of demos, and the second is for editing
various other parameters of the screensaver.
MENU COMMANDS
All of these commands are on either the File or Help menus:
Blank Screen Now
Activates the background xscreensaver daemon, which will then run a
demo at random. This is the same as running xscreensaver-com‐
mand(1) with the -activate option.
Lock Screen Now
Just like Blank Screen Now, except the screen will be locked as
well (even if it is not configured to lock all the time.) This is
the same as running xscreensaver-command(1) with the -lock option.
Kill Daemon
If the xscreensaver daemon is running on this screen, kill it.
This is the same as running xscreensaver-command(1) with the -exit
option.
Restart Daemon
If the xscreensaver daemon is running on this screen, kill it.
Then launch it again. This is the same as doing ``xscreensaver-
command -exit'' followed by ``xscreensaver''.
Note that it is not the same as doing ``xscreensaver-command
-restart''.
Exit
Exits the xscreensaver-demo program (this program) without affect‐
ing the background xscreensaver daemon, if any.
About...
Displays the version number of this program, xscreensaver-demo.
Documentation...
Opens up a web browser looking at the XScreenSaver web page, where
you can find online copies of the xscreensaver(1), xscreen‐
saver-demo(1), and xscreensaver-command(1) manuals.
GRAPHICS DEMOS TAB
On the left is a list of the names of the various display modes, and on
the right are some fields that let you edit their behavior.
Demo List
Double-clicking in the list on the left will let you try out the
indicated demo. The screen will go black, and the program will run
in full-screen mode, just as it would if the xscreensaver daemon
had launched it. Clicking the mouse again will stop the demo and
un-blank the screen, making the dialog box visible again.
Single-clicking in the list will populate the fields on the right
side of the window.
Each name in the list has a checkbox next to it: this is a dupli‐
cate of the Enabled checkbox, and indicates (and controls) whether
xscreensaver will use this display mode at all. If the box is not
checked, then this demo will not be run automatically (though you
can run it explicitly by double-clicking on its name.)
Arrow Buttons
Beneath the list are a pair of up and down arrows. Clicking on the
down arrow will select the next item in the list, and then run it
in full-screen mode, just as if you had double-clicked on it. The
up arrow goes the other way. This is just a shortcut for trying
out all of the display modes in turn.
Program Description
At the top will be a brief description of the program. Below that
is a text field where you can edit the arguments to the program as
xscreensaver will invoke it. (Note that most of these programs
have their own man pages that describe the command-line options
they take.)
Enabled
The Enabled checkbox controls whether xscreensaver will use this
display mode at all. This way, all the modes can remain available,
but you can choose which ones will be automatically run.
Visual
The Visual field is where you can select the X visual type that
this demo will require. If you specify one (other than Any) then
the program will only be run on that kind of visual. For example,
you can specify that a particular program should only be run if
color is available, and another should only be run in monochrome.
See the discussion of the programs parameter in the Configuration
section of the xscreensaver(1) manual.
This is a combo-box, so you can either select an item from the
popup menu, or type in a specific visual's hexadecimal ID.
Demo
This button runs the demo in full-screen mode so that you can try
it out. Click the mouse to dismiss it.
Documentation
Since each of the display modes is actually a separate program,
they each may have their own manual. This opens a window viewing
the man page of this program, if it has one.
SCREENSAVER OPTIONS TAB
This tab lets you change various settings used by the xscreensaver dae‐
mon itself, rather than its sub-programs.
Blank After
After the user has been idle this long, the xscreensaver daemon
will blank the screen.
Cycle After
After the screensaver has been running for this long, the currently
running graphics demo will be killed, and a new one started. If
this is 0, then the graphics demo will never be changed: only one
demo will run until the screensaver is deactivated by user activ‐
ity.
Require Password
Whether the screen saver should lock the screen when it activates.
Lock After
If Require Password is selected, this controls the length of the
``grace period'' between when the screensaver activates, and when
the screen becomes locked. For example, if this is 0:05:00, and
Blank After is 0:10:00, then after 10 minutes, the screen would
blank. If there was user activity at 12 minutes, no password
would be required to un-blank the screen. But, if there was user
activity at 15 minutes or later (that is, Lock After minutes after
activation) then a password would be required. The default is 0,
meaning that if locking is enabled, then a password will be
required as soon as the screen blanks.
Verbose Diagnostics
Whether to print lots of debugging information.
Display Subprocess Errors
If this is set, then if one of the graphics demos prints something
to stdout or stderr, it will show up on the screen immediately
(instead of being lost in a hidden terminal or file that you can't
see.)
If you change this option, it will only take effect the next time
the xscreensaver daemon is restarted. (All other settings take
effect immediately.)
Display Splash Screen at Startup
Normally when xscreensaver starts up, it briefly displays a splash
dialog showing the version number, a Help button, etc. If this
option is turned off, the splash screen will not be shown at all.
Power Management Enabled
Whether the monitor should be powered down after a period of inac‐
tivity.
If this option is grayed out, it means your X server does not sup‐
port 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 set‐
tings in the BIOS in some hardware-specific way.
Standby After
If Power Management Enabled is selected, the monitor will go black
after this much idle time. (Graphics demos will stop running,
also.)
Suspend After
If Power Management Enabled is selected, the monitor will go into
power-saving mode after this much idle time. This duration should
be greater than or equal to Standby.
Off After
If Power Management Enabled is selected, the monitor will fully
power down after this much idle time. This duration should be
greater than or equal to Suspend.
Install Colormap
Whether to install a private colormap while the screensaver is
active, so that the graphics hacks can get as many colors as possi‐
ble. (This only applies when the screen's default visual is being
used, since non-default visuals get their own colormaps automati‐
cally.) This can also be overridden on a per-demo basis.
Fade To Black When Blanking
If selected, then when the screensaver activates, the current con‐
tents of the screen will fade to black instead of simply winking
out. This only works on displays with writable colormaps, that is,
if the screen's default visual is a PseudoColor visual. A fade
will also be done when switching graphics hacks (when the Cycle
After expires.)
Unfade From Black When Unblanking
The complement to Fade Colormap: if selected, then when the screen‐
saver deactivates, the original contents of the screen will fade in
from black instead of appearing immediately. This only works on
displays with writable colormaps, and when Fade Colormap is also
selected.
Fade Duration
When fading or unfading are selected, this controls how long the
fade will take.
There are more settings than these available, but these are the most
commonly used ones; see the manual for xscreensaver(1) for other param‐
eters that can be set by editing the ~/.xscreensaver file, or the X
resource database.
COMMAND-LINE OPTIONS
xscreensaver-demo accepts the following command line options.
-display host:display.screen
The X display to use. The xscreensaver-demo program will open
its window on that display, and also control the xscreensaver
daemon that is managing that same display.
-prefs Start up with the Screensaver Options tab selected by default
instead of the Graphics Demos tab.
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.
ENVIRONMENT
DISPLAY to get the default host and display number.
PATH to find the sub-programs to run. However, note that the sub-
programs are actually launched by the xscreensaver daemon, not
by xscreensaver-demo itself. So, what matters is what $PATH
the xscreensaver program sees.
HOME for the directory in which to read and write the .xscreensaver
file.
XENVIRONMENT
to get the name of a resource file that overrides the global
resources stored in the RESOURCE_MANAGER property.
UPGRADES
The latest version can always be found at http://www.jwz.org/xscreen‐
saver/
SEE ALSO
X(1), xscreensaver(1), xscreensaver-command(1)
COPYRIGHT
Copyright © 1992, 1993, 1997, 1998, 1999, 2000, 2001 by Jamie Zawinski.
Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee, pro‐
vided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in sup‐
porting documentation. No representations are made about the suitabil‐
ity of this software for any purpose. It is provided "as is" without
express or implied warranty.
AUTHOR
Jamie Zawinski <jwz@jwz.org>, 13-aug-92.
Please let me know if you find any bugs or make any improvements.
X Version 11 19-Mar-2001 (3.30) XScreenSaver(1)
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