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 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

SEE ALSO

       systemd-sleep(8), systemd-suspend.service(8), systemd-hibernate.service(8), systemd-hybrid-sleep.service(8), systemd-suspend-then-
       hibernate.service(8), systemd(1), systemd.directives(7)

systemd 237														     SYSTEMD-SLEEP.CONF(5)