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preview area, and some fields that let you configure screen saver behavior.
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This option menu controls the behavior of the screen saver. The options are:
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This option menu controls the activation behavior of the screen saver.
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.B Disable Screen Saver
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Don't ever blank the screen, and don't ever allow the monitor to power down.
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.B Blank Screen Only
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When blanking the screen, just go black: don't run any graphics hacks.
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When blanking the screen, just go black: don't run any graphics.
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.B Only One Screen Saver
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When blanking the screen, only ever use one particular display mode (the
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one selected in the list.)
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.B Random Screen Saver
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When blanking the screen, select a random display mode from among those
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that are enabled and applicable. This is the default.
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that are enabled and applicable. If there are multiple monitors
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connected, run a different display mode on each one. This is the default.
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.B Random Same Saver
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This option only appears if you have multiple monitors.
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This is just like \fBRandom Screen Saver\fP, except that the \fIsame\fP
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randomly-chosen display mode will be run on all monitors, instead of a
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different one being run on each.
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randomly-chosen display mode will be run on all monitors, instead of
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different ones on each.
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Double-clicking in the list on the left will let you try out the indicated
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demo. The screen will go black, and the program will run in full-screen
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mode, just as it would if the \fIxscreensaver\fP daemon had launched it.
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Clicking the mouse again will stop the demo and un-blank the screen, making
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the dialog box visible again.
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Clicking the mouse again will stop the demo and un-blank the screen.
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Single-clicking in the list will run it in the small preview pane on the
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right. (But beware: many of the display modes behave somewhat differently
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This button will pop up a dialog where you can configure settings specific
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to the display mode selected in the list.
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When you click on the \fISettings\fP button on the \fIDisplay Modes\fP
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tab, a configuration dialog will pop up that lets you customize settings
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of the selected display mode. Each display mode has its own custom
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configuration controls on the left side.
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On the right side is a paragraph or two describing the display mode.
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Below that is a \fBDocumentation\fP button that will display the display
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mode's manual page, if it has one, in a new window (since each of the
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display modes is actually a separate program, they each have their
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The \fBAdvanced\fP button reconfigures the dialog box so that you can
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edit the display mode's command line directly, instead of using the
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This tab lets you change various settings used by the xscreensaver daemon
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itself, rather than its sub-programs.
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itself, as well as some global options shared by all of the display modes.
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.B Image Manipulation
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Some of the graphics hacks manipulate images. These settings control
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where those source images come from.
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(All of these options work by invoking the
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.BR xscreensaver\-getimage (1)
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program, which is what actually does the work.)
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.B Grab Desktop Images
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Some of the graphics hacks manipulate images. If this option is selected,
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then they are allowed to manipulate the desktop image, that is, a display
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mode might draw a picture of your desktop melting, or being distorted in
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some way. The security-paranoid might want to disable this option, because
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if it is set, it means that the windows on your desktop will occasionally
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be visible while your screen is locked. Others will not be able
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to \fIdo\fP anything, but they may be able to \fIsee\fP whatever you
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If this option is selected, then they are allowed to manipulate the
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desktop image, that is, a display mode might draw a picture of your
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desktop melting, or being distorted in some way. The
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security-paranoid might want to disable this option, because if it is
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set, it means that the windows on your desktop will occasionally be
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visible while your screen is locked. Others will not be able to
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\fIdo\fP anything, but they may be able to \fIsee\fP whatever you left
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.B Grab Video Frames
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If your system has a video capture card, selecting this option will allow
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.B Choose Random Image
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If this option is set, then the image-manipulating modes will select a
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random image file from disk, from the directory you specify in the text
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entry field. That directory will be recursively searched for files,
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and it is assumed that all the files under that directory are images.
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If more than one of these options are selected, then one will be chosen at
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random. If none of them are selected, then an image of video colorbars will
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(All three of these options work by invoking the
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.BR xscreensaver\-getimage (1)
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program, which is what actually does the work.)
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random image file to operate on, from the specified source. That
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source may be a local directory, which will be recursively searched
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for images. Or, it may be the URL of an RSS or Atom feed (e.g., a
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Flickr gallery), in which case a random image from that feed will be
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selected instead. The contents of the feed will be cached locally and
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refreshed periodically as needed.
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If more than one of the above image-related options are selected, then
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one will be chosen at random. If none of them are selected, then an
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image of video colorbars will be used instead.
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.B Text Manipulation
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Some of the display modes display and manipulate text. The following
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options control how that text is generated. (These parameters control
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the behavior of the
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.BR xscreensaver\-text (1)
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program, which is what actually does the work.)
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.B Host Name and Time
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If this checkbox is selected, then the text used by the screen savers
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will be the local host name, date, time, and system load.
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will be the local host name, OS version, date, time, and system load.
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If this checkbox is selected, then the literal text typed in the
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it will be converted to plain-text first.
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Note: this re-downloads the document every time the screen saver
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runs out of text! It might be considered abusive for you to point
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this at a web server that you do not control, as it will probably
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be hitting that server multiple times a minute.
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runs out of text, so it will probably be hitting that web server multiple
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times a minute. Be careful that the owner of that server doesn't
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consider that to be abusive.
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.B Power Management Settings
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These settings control whether, and when, your monitor powers down.
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.B Power Management Enabled
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Whether the monitor should be powered down after a period of inactivity.
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way, the power management idle-timers can be completely disabled, but
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the screen will be powered off when black. (This might be preferable
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.B Fading and Colormaps
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These options control how the screen fades to or from black when
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a screen saver begins or ends.
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.B Fade To Black When Blanking
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If selected, then when the screensaver activates, the current contents
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colors as possible. This does nothing if you are running in 16-bit
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There are more settings than these available, but these are the most
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commonly used ones; see the manual for
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.BR xscreensaver (1)
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for other parameters that can be set by editing the \fI~/.xscreensaver\fP
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file, or the X resource database.
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When you click on the \fISettings\fP button on the \fIDisplay Modes\fP
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tab, a configuration dialog will pop up that lets you customize settings
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of the selected display mode. Each display mode has its own custom
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configuration controls on the left side.
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On the right side is a paragraph or two describing the display mode.
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Below that is a \fBDocumentation\fP button that will display the display
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mode's manual page, if it has one, in a new window (since each of the
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display modes is actually a separate program, they each may have their
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The \fBAdvanced\fP button reconfigures the dialog box so that you can
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edit the display mode's command line directly, instead of using the
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graphical controls. It also lets you configure the X visual type that
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this mode will require. If you specify one (other than \fIAny\fP) then
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the program will only be run on that kind of visual. For example, you
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can specify that a particular program should only be run if color is
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available, and another should only be run in monochrome. See the
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discussion of the \fIprograms\fP parameter in the \fIConfiguration\fP
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manual. (OpenGL programs should always have their visual set to "GL".)
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.SH COMMAND-LINE OPTIONS
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.I xscreensaver\-demo
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accepts the following command line options.
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to find the sub-programs to run. However, note that the sub-programs
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are actually launched by the \fIxscreensaver\fP daemon, not
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by \fIxscreensaver-demo\fP itself. So, what matters is what \fB$PATH\fP
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the \fIxscreensaver\fP program sees.
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that the \fIxscreensaver\fP program sees.
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for the directory in which to read and write the \fI.xscreensaver\fP file.
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.B HTTP_PROXY\fR or \fPhttp_proxy
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to get the default HTTP proxy host and port.
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The latest version can always be found at
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http://www.jwz.org/xscreensaver/
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The latest version of xscreensaver, an online version of this manual,
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and a FAQ can always be found at http://www.jwz.org/xscreensaver/
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.BR xscreensaver (1),
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.BR xscreensaver\-getimage (1),
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.BR xscreensaver\-text (1)
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Copyright \(co 1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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by Jamie Zawinski. Permission to use, copy, modify, distribute, and sell
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this software and its documentation for any purpose is hereby granted without
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fee, provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in supporting
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documentation. No representations are made about the suitability of this
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software for any purpose. It is provided "as is" without express or implied
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Copyright \(co 1992-2011 by Jamie Zawinski.
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Permission to use, copy, modify, distribute, and sell this software
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and its documentation for any purpose is hereby granted without fee,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation. No representations are made about the
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suitability of this software for any purpose. It is provided "as is"
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without express or implied warranty.
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Jamie Zawinski <jwz@jwz.org>, 13-aug-92.
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driver/xscreensaver-demo.man
