systemd-sleep.conf

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 set during compilation, so configuration is
       only needed when it is necessary to deviate from those defaults.
       Initially, the main configuration file in /etc/systemd/ contains
       commented out entries showing the defaults as a guide to the
       administrator. Local overrides can be created by editing this file or by
       creating drop-ins, as described below. Using drop-ins for local
       configuration is recommended over modifications to the main configuration
       file.

       In addition to the "main" configuration file, drop-in configuration
       snippets are read from /usr/lib/systemd/*.conf.d/,
       /usr/local/lib/systemd/*.conf.d/, and /etc/systemd/*.conf.d/. Those
       drop-ins have higher precedence and override the main 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
       sorted last takes precedence, and for options which accept a list of
       values, entries are collected as they occur in the sorted files.

       When packages need to customize the configuration, they can install
       drop-ins under /usr/. Files in /etc/ are reserved for the local
       administrator, who may use this logic to override the configuration files
       installed by vendor packages. Drop-ins have to be used to override
       package drop-ins, since the main configuration file has lower precedence.
       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 247                                                SYSTEMD-SLEEP.CONF(5)