mirror of
https://github.com/systemd/systemd
synced 2024-11-05 18:25:39 +00:00
0b958bb3ee
Previously, we'd only freeze user.slice in the case of s2h, because we didn't want the user session to resume while systemd was transitioning from suspend to hibernate. This commit extends this freezing behavior to all sleep modes. We also have an environment variable to disable the freezing behavior outright. This is a necessary workaround for someone that has hooks in /usr/lib/systemd/system-sleep/ which communicate with some process running under user.slice, or if someone is using the proprietary NVIDIA driver which breaks when user.slice is frozen (issue #27559) Fixes #27559
138 lines
6.6 KiB
XML
138 lines
6.6 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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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/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-suspend.service"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-suspend.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-suspend.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-suspend.service</refname>
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<refname>systemd-hibernate.service</refname>
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<refname>systemd-hybrid-sleep.service</refname>
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<refname>systemd-suspend-then-hibernate.service</refname>
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<refname>systemd-sleep</refname>
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<refpurpose>System sleep state logic</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><simplelist>
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<member><filename>systemd-suspend.service</filename></member>
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<member><filename>systemd-hibernate.service</filename></member>
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<member><filename>systemd-hybrid-sleep.service</filename></member>
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<member><filename>systemd-suspend-then-hibernate.service</filename></member>
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<member><filename>/usr/lib/systemd/system-sleep</filename></member>
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</simplelist></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-suspend.service</filename> is a system
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service that is pulled in by <filename>suspend.target</filename>
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and is responsible for the actual system suspend. Similarly,
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<filename>systemd-hibernate.service</filename> is pulled in by
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<filename>hibernate.target</filename> to execute the actual
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hibernation. Finally,
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<filename>systemd-hybrid-sleep.service</filename> is pulled in by
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<filename>hybrid-sleep.target</filename> to execute hybrid
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hibernation with system suspend and pulled in by
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<filename>suspend-then-hibernate.target</filename> to execute system suspend
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with a timeout that will activate hibernate later.</para>
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<para>Immediately before entering system suspend and/or
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hibernation <filename>systemd-suspend.service</filename> (and the
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other mentioned units, respectively) will run all executables in
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<filename>/usr/lib/systemd/system-sleep/</filename> and pass two
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arguments to them. The first argument will be
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<literal>pre</literal>, the second either
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<literal>suspend</literal>, <literal>hibernate</literal>,
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<literal>hybrid-sleep</literal>, or <literal>suspend-then-hibernate</literal>
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depending on the chosen action. An environment variable called <literal>SYSTEMD_SLEEP_ACTION</literal>
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will be set and contain the sleep action that is processing. This is primarily helpful for
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<literal>suspend-then-hibernate</literal> where the value of the variable will be <literal>suspend</literal>, <literal>hibernate</literal>,
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or <literal>suspend-after-failed-hibernate</literal> in cases where hibernation has failed.
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Immediately after leaving system suspend and/or hibernation the
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same executables are run, but the first argument is now
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<literal>post</literal>. All executables in this directory are
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executed in parallel, and execution of the action is not continued
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until all executables have finished. Note that <filename>user.slice</filename> will
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be frozen while the executables are running, so they should not attempt to
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communicate with any user services expecting a reply.</para>
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<para>Note that scripts or binaries dropped in
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<filename>/usr/lib/systemd/system-sleep/</filename> are intended
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for local use only and should be considered hacks. If applications
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want to react to system suspend/hibernation and resume,
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they should rather use the <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/inhibit">Inhibitor
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interface</ulink>.</para>
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<para>Note that <filename>systemd-suspend.service</filename>,
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<filename>systemd-hibernate.service</filename>, <filename>systemd-hybrid-sleep.service</filename>, and
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<filename>systemd-suspend-then-hibernate.service</filename> should never be executed directly. Instead,
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trigger system sleep with a command such as <command>systemctl suspend</command> or <command>systemctl
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hibernate</command>.</para>
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<para>Internally, this service will echo a string like
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<literal>mem</literal> into <filename>/sys/power/state</filename>,
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to trigger the actual system suspend. What exactly is written
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where can be configured in the [Sleep] section
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of <filename>/etc/systemd/sleep.conf</filename> or a
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<filename>sleep.conf.d</filename> file. See
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<citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>Note that by default these services freeze <filename>user.slice</filename> while they run. This prevents
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the execution of any process in any of the user sessions while the system is entering into and resuming from
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sleep. Thus, this prevents the hooks in <filename>/usr/lib/systemd/system-sleep/</filename>, or any other process
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for that matter, from communicating with any user session process during sleep.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para><command>systemd-sleep</command> understands the
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following commands:</para>
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<variablelist>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<varlistentry>
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<term><option>suspend</option></term>
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<term><option>hibernate</option></term>
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<term><option>suspend-then-hibernate</option></term>
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<term><option>hybrid-sleep</option></term>
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<listitem><para>Suspend, hibernate, suspend then hibernate, or put the
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system to hybrid sleep.</para>
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<xi:include href="version-info.xml" xpointer="v203"/>
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</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>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd-sleep.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>systemd-halt.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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