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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-sleep.conf"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemd-sleep.conf</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-sleep.conf</refentrytitle>
<manvolnum>5</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-sleep.conf</refname>
<refname>sleep.conf.d</refname>
<refpurpose>Suspend and hibernation configuration file</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/etc/systemd/sleep.conf</filename></para>
<para><filename>/etc/systemd/sleep.conf.d/*.conf</filename></para>
<para><filename>/run/systemd/sleep.conf.d/*.conf</filename></para>
<para><filename>/usr/lib/systemd/sleep.conf.d/*.conf</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>systemd</command> supports four general
power-saving modes:</para>
<variablelist>
<varlistentry>
<term>suspend</term>
<listitem><para>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.
</para></listitem>
</varlistentry>
<varlistentry>
<term>hibernate</term>
<listitem><para>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.
</para></listitem>
</varlistentry>
<varlistentry>
<term>hybrid-sleep</term>
<listitem><para>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.
</para></listitem>
</varlistentry>
<varlistentry>
<term>suspend-then-hibernate</term>
<listitem>
<para>A low power state where the system is initially suspended (the state is stored in
RAM). If the system supports low-battery alarms (ACPI _BTP), then the system will be woken up by
the ACPI low-battery signal and hibernated (the state is then stored on disk). Also, if not
interrupted within the timespan specified by <varname>HibernateDelaySec=</varname> or the estimated
timespan until the system battery charge level goes down to 5%, then the system will be woken up by the
RTC alarm and hibernated. The estimated timespan is calculated from the change of the battery
capacity level after the time specified by <varname>SuspendEstimationSec=</varname> or when
the system is woken up from the suspend.</para>
</listitem>
</varlistentry>
</variablelist>
<para>Settings in these files determine what strings
will be written to
<filename>/sys/power/disk</filename> and
<filename>/sys/power/state</filename> by
<citerefentry><refentrytitle>systemd-sleep</refentrytitle><manvolnum>8</manvolnum></citerefentry>
when
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
attempts to suspend or hibernate the machine.
See
<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry>
for a general description of the syntax.</para>
</refsect1>
<xi:include href="standard-conf.xml" xpointer="main-conf" />
<refsect1>
<title>Options</title>
<para>The following options can be configured in the
[Sleep] section of
<filename>/etc/systemd/sleep.conf</filename> or a
<filename>sleep.conf.d</filename> file:</para>
<variablelist class='config-directives'>
<varlistentry>
<term><varname>AllowSuspend=</varname></term>
<term><varname>AllowHibernation=</varname></term>
<term><varname>AllowSuspendThenHibernate=</varname></term>
<term><varname>AllowHybridSleep=</varname></term>
<listitem><para>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.</para>
<para>If <varname>AllowHibernation=no</varname> or <varname>AllowSuspend=no</varname> is
used, this implies <varname>AllowSuspendThenHibernate=no</varname> and
<varname>AllowHybridSleep=no</varname>, since those methods use both suspend and hibernation
internally. <varname>AllowSuspendThenHibernate=yes</varname> and
<varname>AllowHybridSleep=yes</varname> can be used to override and enable those specific
modes.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>SuspendMode=</varname></term>
<term><varname>HibernateMode=</varname></term>
<term><varname>HybridSleepMode=</varname></term>
<listitem><para>The string to be written to
<filename>/sys/power/disk</filename> by,
respectively,
<citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, or
<citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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.
</para>
<para><citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
uses the value of <varname>SuspendMode=</varname> when suspending and the value of <varname>HibernateMode=</varname> when hibernating.
</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>SuspendState=</varname></term>
<term><varname>HibernateState=</varname></term>
<term><varname>HybridSleepState=</varname></term>
<listitem><para>The string to be written to
<filename>/sys/power/state</filename> by,
respectively,
<citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, or
<citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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.
</para>
<para><citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
uses the value of <varname>SuspendState=</varname> when suspending and the value of <varname>HibernateState=</varname> when hibernating.
</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>HibernateDelaySec=</varname></term>
<listitem>
<para>The amount of time the system spends in suspend mode before the system is
automatically put into hibernate mode. Only used by
<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
If the system has a battery, then defaults to the estimated timespan until the system battery charge level goes down to 5%.
If the system has no battery, then defaults to 2h.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SuspendEstimationSec=</varname></term>
<listitem>
<para>The RTC alarm will wake the system after the specified timespan to measure the system battery
capacity level and estimate battery discharging rate, which is used for estimating timespan until the system battery charge
level goes down to 5%. Only used by
<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
Defaults to 1h.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Example: freeze</title>
<para>Example: to exploit the <quote>freeze</quote> mode added
in Linux 3.9, one can use <command>systemctl suspend</command>
with
<programlisting>[Sleep]
SuspendState=freeze</programlisting></para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd-sleep</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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