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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION DIRECTORIES AND PRECEDENCE | OPTIONS | EXAMPLE: FREEZE | SEE ALSO | COLOPHON |
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SYSTEMD-SLEEP.CONF(5) systemd-sleep.conf SYSTEMD-SLEEP.CONF(5)
systemd-sleep.conf, sleep.conf.d - Suspend and hibernation
configuration file
/etc/systemd/sleep.conf
/etc/systemd/sleep.conf.d/*.conf
/run/systemd/sleep.conf.d/*.conf
/usr/lib/systemd/sleep.conf.d/*.conf
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.
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.
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: to exploit the “freeze” mode added in Linux 3.9, one can
use systemctl suspend with
[Sleep]
SuspendState=freeze
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)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 247 SYSTEMD-SLEEP.CONF(5)
Pages that refer to this page: systemd.directives(7), systemd.index(7), systemd.syntax(7), systemd-suspend.service(8)
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