chiark / gitweb /
man: ipv4 link-local
[elogind.git] / man / systemd-backlight@.service.xml
1 <?xml version="1.0"?>
2 <!--*-nxml-*-->
3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
4 <!--
5   This file is part of systemd.
6
7   Copyright 2013 Lennart Poettering
8
9   systemd is free software; you can redistribute it and/or modify it
10   under the terms of the GNU Lesser General Public License as published by
11   the Free Software Foundation; either version 2.1 of the License, or
12   (at your option) any later version.
13
14   systemd is distributed in the hope that it will be useful, but
15   WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17   Lesser General Public License for more details.
18
19   You should have received a copy of the GNU Lesser General Public License
20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
21 -->
22 <refentry id="systemd-backlight@.service" conditional='ENABLE_BACKLIGHT'>
23
24         <refentryinfo>
25                 <title>systemd-backlight@.service</title>
26                 <productname>systemd</productname>
27
28                 <authorgroup>
29                         <author>
30                                 <contrib>Developer</contrib>
31                                 <firstname>Lennart</firstname>
32                                 <surname>Poettering</surname>
33                                 <email>lennart@poettering.net</email>
34                         </author>
35                 </authorgroup>
36         </refentryinfo>
37
38         <refmeta>
39                 <refentrytitle>systemd-backlight@.service</refentrytitle>
40                 <manvolnum>8</manvolnum>
41         </refmeta>
42
43         <refnamediv>
44                 <refname>systemd-backlight@.service</refname>
45                 <refname>systemd-backlight</refname>
46                 <refpurpose>Load and save the display backlight brightness at boot and shutdown</refpurpose>
47         </refnamediv>
48
49         <refsynopsisdiv>
50                 <para><filename>systemd-backlight@.service</filename></para>
51                 <para><filename>/usr/lib/systemd/systemd-backlight</filename></para>
52         </refsynopsisdiv>
53
54         <refsect1>
55                 <title>Description</title>
56
57                 <para><filename>systemd-backlight@.service</filename>
58                 is a service that restores the display backlight
59                 brightness at early boot and saves it at shutdown. On
60                 disk, the backlight brightness is stored in
61                 <filename>/var/lib/systemd/backlight/</filename>.</para>
62         </refsect1>
63
64         <refsect1>
65                 <title>Kernel Command Line</title>
66
67                 <para><filename>systemd-backlight</filename> understands
68                 the following kernel command line parameter:</para>
69
70                 <variablelist class='kernel-commandline-options'>
71                         <varlistentry>
72                                 <term><varname>systemd.restore_state=</varname></term>
73
74                                 <listitem><para>Takes a boolean
75                                 argument. Defaults to
76                                 <literal>1</literal>. If
77                                 <literal>0</literal>, does not restore
78                                 the backlight settings on boot. However,
79                                 settings will still be stored on shutdown.
80                                 </para></listitem>
81                         </varlistentry>
82                 </variablelist>
83         </refsect1>
84
85         <refsect1>
86                 <title>See Also</title>
87                 <para>
88                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
89                 </para>
90         </refsect1>
91
92 </refentry>