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ec07c3c80b
This tries to add information about when each option was added. It goes back to version 183. The version info is included from a separate file to allow generating it, which would allow more control on the formatting of the final output.
254 lines
11 KiB
XML
254 lines
11 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-sleep.conf"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-sleep.conf</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-sleep.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-sleep.conf</refname>
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<refname>sleep.conf.d</refname>
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<refpurpose>Suspend and hibernation configuration file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/systemd/sleep.conf</filename></para>
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<para><filename>/etc/systemd/sleep.conf.d/*.conf</filename></para>
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<para><filename>/run/systemd/sleep.conf.d/*.conf</filename></para>
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<para><filename>/usr/lib/systemd/sleep.conf.d/*.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd</command> supports four general
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power-saving modes:</para>
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<variablelist>
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<varlistentry>
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<term>suspend</term>
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<listitem><para>a low-power state
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where execution of the OS is paused,
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and complete power loss might result
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in lost data, and which is fast to
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enter and exit. This corresponds to
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suspend, standby, or freeze states as
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understood by the kernel.
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</para>
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<xi:include href="version-info.xml" xpointer="v203"/></listitem>
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</varlistentry>
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<varlistentry>
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<term>hibernate</term>
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<listitem><para>a low-power state
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where execution of the OS is paused,
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and complete power loss does not
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result in lost data, and which might
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be slow to enter and exit. This
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corresponds to the hibernation as
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understood by the kernel.
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</para>
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<xi:include href="version-info.xml" xpointer="v203"/></listitem>
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</varlistentry>
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<varlistentry>
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<term>hybrid-sleep</term>
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<listitem><para>a low-power state
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where execution of the OS is paused,
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which might be slow to enter, and on
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complete power loss does not result in
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lost data but might be slower to exit
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in that case. This mode is called
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suspend-to-both by the kernel.
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</para>
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<xi:include href="version-info.xml" xpointer="v203"/></listitem>
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</varlistentry>
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<varlistentry>
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<term>suspend-then-hibernate</term>
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<listitem>
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<para>A low power state where the system is initially suspended (the state is stored in
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RAM). If the system supports low-battery alarms (ACPI _BTP), then the system will be woken up by
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the ACPI low-battery signal and hibernated (the state is then stored on disk). Also, if not
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interrupted within the timespan specified by <varname>HibernateDelaySec=</varname> or the estimated
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timespan until the system battery charge level goes down to 5%, then the system will be woken up by the
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RTC alarm and hibernated. The estimated timespan is calculated from the change of the battery
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capacity level after the time specified by <varname>SuspendEstimationSec=</varname> or when
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the system is woken up from the suspend.</para>
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<xi:include href="version-info.xml" xpointer="v239"/>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>Settings in these files determine what strings
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will be written to
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<filename>/sys/power/disk</filename> and
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<filename>/sys/power/state</filename> by
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<citerefentry><refentrytitle>systemd-sleep</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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when
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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attempts to suspend or hibernate the machine.
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See
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<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for a general description of the syntax.</para>
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</refsect1>
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<xi:include href="standard-conf.xml" xpointer="main-conf" />
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<refsect1>
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<title>Options</title>
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<para>The following options can be configured in the
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[Sleep] section of
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<filename>/etc/systemd/sleep.conf</filename> or a
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<filename>sleep.conf.d</filename> file:</para>
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<variablelist class='config-directives'>
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<varlistentry>
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<term><varname>AllowSuspend=</varname></term>
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<term><varname>AllowHibernation=</varname></term>
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<term><varname>AllowSuspendThenHibernate=</varname></term>
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<term><varname>AllowHybridSleep=</varname></term>
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<listitem><para>By default any power-saving mode is advertised if possible (i.e.
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the kernel supports that mode, the necessary resources are available). Those
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switches can be used to disable specific modes.</para>
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<para>If <varname>AllowHibernation=no</varname> or <varname>AllowSuspend=no</varname> is
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used, this implies <varname>AllowSuspendThenHibernate=no</varname> and
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<varname>AllowHybridSleep=no</varname>, since those methods use both suspend and hibernation
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internally. <varname>AllowSuspendThenHibernate=yes</varname> and
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<varname>AllowHybridSleep=yes</varname> can be used to override and enable those specific
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modes.</para>
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<xi:include href="version-info.xml" xpointer="v240"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SuspendMode=</varname></term>
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<term><varname>HibernateMode=</varname></term>
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<term><varname>HybridSleepMode=</varname></term>
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<listitem><para>The string to be written to <filename>/sys/power/disk</filename> by, respectively,
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<citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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or
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<citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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More than one value can be specified by separating multiple values with whitespace. They will be
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tried in turn, until one is written without error. If none of the writes succeed, the operation will
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be aborted.</para>
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<para>The allowed set of values is determined by the kernel and is shown in the file itself (use
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<command>cat /sys/power/disk</command> to display). See <ulink
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url="https://www.kernel.org/doc/html/latest/admin-guide/pm/sleep-states.html#basic-sysfs-interfaces-for-system-suspend-and-hibernation">the
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kernel documentation</ulink> for more details.</para>
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<para>
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<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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uses the value of <varname>SuspendMode=</varname> when suspending and the value of
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<varname>HibernateMode=</varname> when hibernating.</para>
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<xi:include href="version-info.xml" xpointer="v203"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SuspendState=</varname></term>
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<term><varname>HibernateState=</varname></term>
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<term><varname>HybridSleepState=</varname></term>
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<listitem><para>The string to be written to <filename>/sys/power/state</filename> by, respectively,
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<citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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or
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<citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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More than one value can be specified by separating multiple values with whitespace. They will be
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tried in turn, until one is written without error. If none of the writes succeed, the operation will
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be aborted.
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</para>
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<para>The allowed set of values is determined by the kernel and is shown in the file itself (use
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<command>cat /sys/power/state</command> to display). See <ulink
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url="https://www.kernel.org/doc/html/latest/admin-guide/pm/sleep-states.html#basic-sysfs-interfaces-for-system-suspend-and-hibernation">the
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kernel documentation</ulink> for more details.</para>
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<para>
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<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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uses the value of <varname>SuspendState=</varname> when suspending and the value of
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<varname>HibernateState=</varname> when hibernating.</para>
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<xi:include href="version-info.xml" xpointer="v203"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>HibernateDelaySec=</varname></term>
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<listitem>
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<para>The amount of time the system spends in suspend mode before the system is
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automatically put into hibernate mode. Only used by
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<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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If the system has a battery, then defaults to the estimated timespan until the system battery charge level goes down to 5%.
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If the system has no battery, then defaults to 2h.</para>
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<xi:include href="version-info.xml" xpointer="v239"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SuspendEstimationSec=</varname></term>
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<listitem>
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<para>The RTC alarm will wake the system after the specified timespan to measure the system battery
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capacity level and estimate battery discharging rate, which is used for estimating timespan until the system battery charge
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level goes down to 5%. Only used by
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<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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Defaults to 1h.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Example: freeze</title>
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<para>Example: to exploit the <quote>freeze</quote> mode added
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in Linux 3.9, one can use <command>systemctl suspend</command>
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with
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<programlisting>[Sleep]
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SuspendState=freeze</programlisting></para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd-sleep</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-hybrid-sleep.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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