Ubuntu Manpage: systemd-sleep.conf, sleep.conf.d - Suspend and hibernation configuration file

name
synopsis
description
configuration directories and precedence
options
example: freeze
see also

Provided by: systemd_237-3ubuntu10.57_amd64

NAME

       systemd-sleep.conf, sleep.conf.d - Suspend and hibernation configuration file

SYNOPSIS

       /etc/systemd/sleep.conf

       /etc/systemd/sleep.conf.d/*.conf

       /run/systemd/sleep.conf.d/*.conf

       /usr/lib/systemd/sleep.conf.d/*.conf

DESCRIPTION

       systemd supports four general power-saving modes:

       suspend
           a low-power state where execution of the OS is paused, and complete power loss might result in lost
           data, and which is fast to enter and exit. This corresponds to suspend, standby, or freeze states as
           understood by the kernel.

       hibernate
           a low-power state where execution of the OS is paused, and complete power loss does not result in
           lost data, and which might be slow to enter and exit. This corresponds to the hibernation as
           understood by the kernel.

       hybrid-sleep
           a low-power state where execution of the OS is paused, which might be slow to enter, and on complete
           power loss does not result in lost data but might be slower to exit in that case. This mode is called
           suspend-to-both by the kernel.

       suspend-then-hibernate
           A low power state where the system is initially suspended (the state is stored in RAM). If not
           interrupted within the delay specified by HibernateDelaySec=, the system will be woken using an RTC
           alarm and hibernated (the state is then stored on disk).

       Settings in these files determine what strings will be written to /sys/power/disk and /sys/power/state by
       systemd-sleep(8) when systemd(1) attempts to suspend or hibernate the machine.

CONFIGURATION DIRECTORIES AND PRECEDENCE

The default configuration is defined during compilation, so a configuration file is only needed when it
is necessary to deviate from those defaults. By default, the configuration file in /etc/systemd/ contains
commented out entries showing the defaults as a guide to the administrator. This file can be edited to
create local overrides.

When packages need to customize the configuration, they can install configuration snippets in
/usr/lib/systemd/*.conf.d/. Files in /etc/ are reserved for the local administrator, who may use this
logic to override the configuration files installed by vendor packages. The main configuration file is
read before any of the configuration directories, and has the lowest precedence; entries in a file in any
configuration directory override entries in the single configuration file. Files in the *.conf.d/
configuration subdirectories are sorted by their filename in lexicographic order, regardless of which of
the subdirectories they reside in. When multiple files specify the same option, for options which accept
just a single value, the entry in the file with the lexicographically latest name takes precedence. For
options which accept a list of values, entries are collected as they occur in files sorted
lexicographically. It is recommended to prefix all filenames in those subdirectories with a two-digit
number and a dash, to simplify the ordering of the files.

To disable a configuration file supplied by the vendor, the recommended way is to place a symlink to
/dev/null in the configuration directory in /etc/, with the same filename as the vendor configuration
file.

OPTIONS

       The following options can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf or a
       sleep.conf.d file:

       SuspendMode=, HibernateMode=, HybridSleepMode=
           The string to be written to /sys/power/disk by, respectively, systemd-suspend.service(8), systemd-
           hibernate.service(8), systemd-hybrid-sleep.service(8), or systemd-suspend-then-hibernate.service(8).
           More than one value can be specified by separating multiple values with whitespace. They will be
           tried in turn, until one is written without error. If neither succeeds, the operation will be
           aborted.

       SuspendState=, HibernateState=, HybridSleepState=
           The string to be written to /sys/power/state by, respectively, systemd-suspend.service(8), systemd-
           hibernate.service(8), systemd-hybrid-sleep.service(8), or systemd-suspend-then-hibernate.service(8).
           More than one value can be specified by separating multiple values with whitespace. They will be
           tried in turn, until one is written without error. If neither succeeds, the operation will be
           aborted.

       HibernateDelaySec=
           The amount of time in seconds that will pass before the system is automatically put into hibernate
           when using systemd-suspend-then-hibernate.service(8).

EXAMPLE: FREEZE

       Example: to exploit the “freeze” mode added in Linux 3.9, one can use systemctl suspend with

           [Sleep]
           SuspendState=freeze