diff options
Diffstat (limited to 'src/grp-initprogs/systemd-backlight/systemd-backlight@.service.xml')
-rw-r--r-- | src/grp-initprogs/systemd-backlight/systemd-backlight@.service.xml | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/grp-initprogs/systemd-backlight/systemd-backlight@.service.xml b/src/grp-initprogs/systemd-backlight/systemd-backlight@.service.xml new file mode 100644 index 0000000000..3459ed8851 --- /dev/null +++ b/src/grp-initprogs/systemd-backlight/systemd-backlight@.service.xml @@ -0,0 +1,94 @@ +<?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> |