SYSTEMD-SLEEP.CONF(5) systemd-sleep.conf SYSTEMD-SLEEP.CONF(5)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 three 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.
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), or
systemd-hybrid-sleep.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), or
systemd-hybrid-sleep.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.
EXAMPLE: FREEZE
Example: to exploit the “freeze” mode added in Linux 3.9, one can use
systemctl suspend with
[Sleep]
SuspendState=freeze
SEE ALSOsystemd-sleep(8), systemd-suspend.service(8), systemd-
hibernate.service(8), systemd-hybrid-sleep.service(8), systemd(1),
systemd.directives(7)systemd 236SYSTEMD-SLEEP.CONF(5)
