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)