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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. See
       systemd.syntax(7) for a general description of the syntax.

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/ or
       /usr/local/lib/systemd/*.conf.d/. 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 in which of the subdirectories they
       reside. 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.

       Files in /etc/ are reserved for the local administrator, who may use
       this logic to override the configuration files installed by vendor
       packages. 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:

       AllowSuspend=, AllowHibernation=, AllowSuspendThenHibernate=,
       AllowHybridSleep=
           By default any power-saving mode is advertised if possible (i.e.
           the kernel supports that mode, the necessary resources are
           available). Those switches can be used to disable specific modes.

           If AllowHibernation=no or AllowSuspend=no is used, this implies
           AllowSuspendThenHibernate=no and AllowHybridSleep=no, since those
           methods use both suspend and hibernation internally.
           AllowSuspendThenHibernate=yes and AllowHybridSleep=yes can be used
           to override and enable those specific modes.

       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 the system spends in suspend mode before the
           system is automatically put into hibernate mode, when using
           systemd-suspend-then-hibernate.service(8). Defaults to 2h.

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 245                                              SYSTEMD-SLEEP.CONF(5)

NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | OPTIONS | EXAMPLE: FREEZE | SEE ALSO