mirror of
https://github.com/systemd/systemd
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227 lines
10 KiB
XML
227 lines
10 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></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></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></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><para>A low power state where initially user.slice unit is freezed.
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If the hardware supports low-battery alarms (ACPI _BTP), then the system is
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first suspended (the state is stored in RAM) and then hibernates if the system
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is woken up by the hardware via ACPI low-battery signal. Unit user.slice is
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thawed when system returns from hibernation. If the hardware does not support
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low-battery alarms (ACPI _BTP), then the system is suspended based on battery's
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current percentage capacity. If the current battery capacity is higher than 5%, the
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system suspends for interval calculated using battery discharge rate per hour or
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<command>HibernateDelaySec=</command>
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if former is not available.
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Battery discharge rate per hour is stored in a file which is created after
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initial suspend-resume cycle. The value is calculated using battery decreasing
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charge level over a timespan for which system was suspended. For each battery
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connected to the system, there is a unique entry. After RTC alarm wakeup from
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suspend, battery discharge rate per hour is again estimated. If the current battery
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charge level is equal to or less than 5%, the system will be hibernated (the state
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is then stored on disk) else the system goes back to suspend for the interval
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calculated using battery discharge rate per hour.
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In case of manual wakeup, if the battery was discharged while the system was
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suspended, the battery discharge rate is estimated and stored on the filesystem.
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In case the system is woken up by the hardware via the ACPI low-battery signal,
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then it hibernates.
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</para></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></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
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<filename>/sys/power/disk</filename> by,
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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>, 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
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multiple values with whitespace. They will be tried
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in turn, until one is written without error. If
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neither succeeds, the operation will be aborted.
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</para>
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<para><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 <varname>HibernateMode=</varname> when hibernating.
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</para></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
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<filename>/sys/power/state</filename> by,
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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>, 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
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multiple values with whitespace. They will be tried
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in turn, until one is written without error. If
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neither succeeds, the operation will be aborted.
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</para>
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<para><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 <varname>HibernateState=</varname> when hibernating.
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</para></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><para>The amount of time the system spends in suspend mode
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before the RTC alarm wakes the system, before the battery discharge rate
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can be estimated and used instead to calculate the suspension interval.
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<citerefentry><refentrytitle>systemd-suspend-then-hibernate.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. Defaults
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to 2h.</para></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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