<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/backlight/</filename>. Note that by
- default only firmware backlight devices are
- saved/restored.</para>
+ brightness at early boot and saves it at shutdown. On
+ disk, the backlight brightness is stored in
+ <filename>/var/lib/systemd/backlight/</filename>.</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>