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I just upgraded to Debian GNU/Linux 11 (bullseye), from Debian 10. After the upgrade it is taking a long time to put the system to sleep.

E.g. the command systemctl suspend, locks the session quickly but takes 30 seconds to put the system to sleep. Is there a configuration that I don't know of (30s is the sort of delay that looks intentional). I get the same result when clicking the sleep widget.

Edits to address some comments / answers

output of cat /etc/systemd/sleep.conf

#  This file is part of systemd.
#
#  systemd is free software; ...«ref to GPL»...
#
# 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 systemd-sleep.conf(5) for details

[Sleep]
#AllowSuspend=yes
#AllowHibernation=yes
#AllowSuspendThenHibernate=yes
#AllowHybridSleep=yes
#SuspendMode=
#SuspendState=mem standby freeze
#HibernateMode=platform shutdown
#HibernateState=disk
#HybridSleepMode=suspend platform shutdown
#HybridSleepState=disk
#HibernateDelaySec=180min

systemctl hibernate takes longer about 40s. It will not wake on key-press, and dose a normal boot via grub, but then goes in to waking from hibernate. Therefore the original command is a suspend to RAM, not hibernate to persistent memory (e.g. disk).

ctrl-alt-delor
  • 27,993

1 Answers1

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Check systemd-sleep.conf whether it's configured for suspend, hibernate or hybrid-sleep.

The latter two will write the full system state to swap, which will take a while, but you are safe from data loss during suspend.

Simon Richter
  • 4,469