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-<?xml version="1.0"?>
-<!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-<!--
- This file is part of systemd.
-
- Copyright 2013 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-<refentry id="systemd-backlight@.service" conditional='ENABLE_BACKLIGHT'>
-
- <refentryinfo>
- <title>systemd-backlight@.service</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd-backlight@.service</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd-backlight@.service</refname>
- <refname>systemd-backlight</refname>
- <refpurpose>Load and save the display backlight brightness at boot and shutdown</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>systemd-backlight@.service</filename></para>
- <para><filename>/usr/lib/systemd/systemd-backlight</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>systemd-backlight@.service</filename> is a service
- that restores the display backlight brightness at early boot and
- saves it at shutdown. On disk, the backlight brightness is stored
- in <filename>/var/lib/systemd/backlight/</filename>. During
- loading, if the udev property <option>ID_BACKLIGHT_CLAMP</option> is
- not set to false, the brightness is clamped to a value of at
- least 1 or 5% of maximum brightness, whichever is greater. This
- restriction will be removed when the kernel allows user space to
- reliably set a brightness value which does not turn off the
- display.</para>
- </refsect1>
-
- <refsect1>
- <title>Kernel Command Line</title>
-
- <para><filename>systemd-backlight</filename> understands the
- following kernel command line parameter:</para>
-
- <variablelist class='kernel-commandline-options'>
- <varlistentry>
- <term><varname>systemd.restore_state=</varname></term>
-
- <listitem><para>Takes a boolean argument. Defaults to
- <literal>1</literal>. If <literal>0</literal>, does not
- restore the backlight settings on boot. However, settings will
- still be stored on shutdown. </para></listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>