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(5) 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)