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. If multiple files specify the same option, the entry in the
   file with the lexicographically latest name takes 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:

   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 ALSO

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

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