Public bug reported:
After upgrading to Ubuntu 18.04, "/usr/bin/xscreensaver-command
-deactivate" is launched every twenty seconds. Behaviour stops if I
kill xfce4-power-manager. Seems this is a [known
problem](https://www.jwz.org/xscreensaver//faq.html#no-blank), and the
solution is to turn off "Presentation Mode". But the new xfce4-power-
manager-settings does not mention "Presentation Mode", and I already
turned off "Display power management".
I replaced /usr/bin/xscreensaver-command with the following to find out
what was launching it, but it always says parent pid (PPID) is '1', as
if it was started by systemd itself or as if the parent process died
before the child started, and orphaned processes are always parented by
pid 1.
#!/bin/bash
# what's causing the wake-ups?
OUT=/tmp/xscreensaver-command-pid.txt
echo "$$ : $0 $@" > $OUT ;
# pstree -l -p >> $OUT
# ps w >> $OUT
#ps o stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm >> $OUT ;
ps f -opid,ppid,cmd $$ >> $OUT
/usr/libexec/xscreensaver/xscreensaver-command "$@"
The $OUT file is created every twenty seconds. If I find the pid for
xfce4-power-manager and `kill` it, then the $OUT file stops updating, so
I feel strongly that xfce4-power-manager is the culprit, and the
documented solution ("turn off Presentation Mode") is no longer
available in Ubuntu 18.04 / xfce4-power-manager 1.6.1
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xfce4-power-manager 1.6.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed May 2 10:45:26 2018
InstallationDate: Installed on 2016-06-05 (696 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: xfce4-power-manager
UpgradeStatus: Upgraded to bionic on 2018-04-27 (5 days ago)
** Affects: xfce4-power-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1768562
Title:
calling "xscreensaver-command -deactivate" every 20 seconds
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