Public bug reported:
Dear colleagues,
We have discovered an abnormal operation of the lightdm
(1.30.0-0ubuntu4~20.04.1) program.
1. When no user is logged in (the initial user selection screen is
displayed) the idle system goes into suspend (sleep) mode. The timeout
for this event is 20 minutes.
2. I tried to cancel the entering into sleep mode. To do this, I altered
the sleep-inactive-ac-timeout and sleep-inactive-battery-timeout
parameters to 0.
The command sudo -H -u lightdm dbus-launch --exit-with-session gsettings
list-recursively org.gnome.settings-daemon.plugins.power gives the
output:
root@supercat:/home/supercat# sudo -H -u lightdm dbus-launch
--exit-with-session gsettings list-recursively
org.gnome.settings-daemon.plugins.power
No protocol specified
org.gnome.settings-daemon.plugins.power lid-close-ac-action 'suspend'
org.gnome.settings-daemon.plugins.power time-critical 300
org.gnome.settings-daemon.plugins.power power-button-action 'suspend'
org.gnome.settings-daemon.plugins.power lid-close-suspend-with-external-monitor
false
org.gnome.settings-daemon.plugins.power button-hibernate 'hibernate'
org.gnome.settings-daemon.plugins.power idle-dim true
org.gnome.settings-daemon.plugins.power button-power 'suspend'
org.gnome.settings-daemon.plugins.power lid-close-battery-action 'suspend'
org.gnome.settings-daemon.plugins.power priority 0
org.gnome.settings-daemon.plugins.power idle-brightness 30
org.gnome.settings-daemon.plugins.power active true
org.gnome.settings-daemon.plugins.power critical-battery-action 'hibernate'
org.gnome.settings-daemon.plugins.power button-suspend 'suspend'
org.gnome.settings-daemon.plugins.power button-sleep 'hibernate'
org.gnome.settings-daemon.plugins.power percentage-critical 3
org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout 0
org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'suspend'
org.gnome.settings-daemon.plugins.power ambient-enabled true
org.gnome.settings-daemon.plugins.power notify-perhaps-recall true
org.gnome.settings-daemon.plugins.power percentage-low 10
org.gnome.settings-daemon.plugins.power percentage-action 2
org.gnome.settings-daemon.plugins.power sleep-inactive-battery-type 'suspend'
org.gnome.settings-daemon.plugins.power time-low 1200
org.gnome.settings-daemon.plugins.power sleep-inactive-battery-timeout 0
org.gnome.settings-daemon.plugins.power time-action 120
org.gnome.settings-daemon.plugins.power use-time-for-policy true
3. I checked the result, the system still suspends (goes into sleep mode) in 20
minutes. I checked the IdleAction parameter in /etc/systemd/logind.conf,
because it may affect the suspend mode. It is set to ignore.
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See logind.conf(5) for details.
[Login]
#NAutoVTs=6
#ReserveVT=6
#KillUserProcesses=no
#KillOnlyUsers=
#KillExcludeUsers=root
#InhibitDelayMaxSec=5
#HandlePowerKey=poweroff
#HandleSuspendKey=suspend
#HandleHibernateKey=hibernate
#HandleLidSwitch=suspend
#HandleLidSwitchExternalPower=suspend
#HandleLidSwitchDocked=ignore
#PowerKeyIgnoreInhibited=no
#SuspendKeyIgnoreInhibited=no
#HibernateKeyIgnoreInhibited=no
#LidSwitchIgnoreInhibited=yes
#HoldoffTimeoutSec=30s
IdleAction=ignore
IdleActionSec=30min
#RuntimeDirectorySize=10%
#RemoveIPC=yes
#InhibitorsMax=8192
#SessionsMax=8192
I came to conclusion that lightdm ignores correctly given setting for
not suspending the system (org.gnome.settings-daemon.plugins.power
sleep-inactive-ac-timeout 0).
Commentaries on this finding are welcome.
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: lightdm sleep suspend
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https://bugs.launchpad.net/bugs/1928305
Title:
Lightdm ignores power saving settings; suspends system in 20 minutes
regardless of sleep-inactive-ac-timeout parameter
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