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.TH XScreenSaver 1 "6-Jan-2021 (6.00)" "X Version 11"
.SH NAME
xscreensaver-systemd - lock the screen upon suspend, and inhibit
screen-blanking during video playback.
.SH SYNOPSIS
.B xscreensaver-systemd [-verbose]
.SH DESCRIPTION
The \fIxscreensaver\-systemd\fP program is a helper program launched by
.BR xscreensaver (1)
for
.BR systemd (1)
or
.BR elogind (8)
integration. It does two things:
.TP 2
\fB*
When the system is about to go to sleep (e.g., the laptop lid has just been
closed) it locks the screen just \fIbefore\fP the system sleeps, by running
\fIxscreensaver-command -suspend\fP. When the system wakes up again, it
runs \fIxscreensaver-command -deactivate\fP to make the unlock dialog appear
immediately. It does this through the
.BR org.freedesktop.login1 (5)
D-Bus interface.
.TP 2
\fB*
When another process on the system asks for the screen saver to be
inhibited (e.g. because a video is playing) this program periodically runs
\fIxscreensaver-command -deactivate\fP to keep the display un-blanked.
It does this until the other program asks for it to stop, or exits.
It does this through the
.BR org.freedesktop.ScreenSaver (5)
D-Bus interface.
.RS 0
.SH BUGS
Only one program at a time can register with
.BR systemd (1)
for screen-saver-related events, so if another screen saver is running as a
part of the desktop environment, \fIxscreensaver-systemd\fP will be unable to
launch. Likely adversaries include
.BR ksmserver (1)
and
.BR gsd\-screensaver\-proxy (1).
.SH SEE ALSO
.BR X (1),
.BR xscreensaver (1),
.BR xscreensaver\-settings (1),
.BR xscreensaver\-command (1),
.BR systemd (1),
.BR sd-bus (3),
.BR elogind (8)
.SH COPYRIGHT
Copyright \(co 2019-2021 by Martin Lucina and Jamie Zawinski.
Permission to use, copy, modify, and/or distribute this software
for any purpose with or without fee is hereby granted, provided
that the above copyright notice and this permission notice appear
in all copies.
The software is provided "as is" and the author disclaims all
warranties with regard to this software including all implied
warranties of merchantability and fitness. in no event shall the
author be liable for any special, direct, indirect, or
consequential damages or any damages whatsoever resulting from loss
of use, data or profits, whether in an action of contract,
negligence or other tortious action, arising out of or in
connection with the use or performance of this software.
.SH AUTHOR
Martin Lucina <martin@lucina.net>, 4-Jun-2019
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