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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-backlight@.service</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
<a href="systemd.directives.html">Directives </a>·
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<span style="float:right">systemd 221</span><hr><div class="refentry"><a name="systemd-backlight@.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-backlight@.service, systemd-backlight — Load and save the display backlight brightness at boot and shutdown</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-backlight@.service</code></p><p><code class="filename">/usr/lib/systemd/systemd-backlight</code></p></div><div class="refsect1"><a name="idm47204625911024"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-backlight@.service</code> 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 <code class="filename">/var/lib/systemd/backlight/</code>. During
loading, if udev property <code class="option">ID_BACKLIGHT_CLAMP</code> is
not set to false value, 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.</p></div><div class="refsect1"><a name="idm47204620948944"></a><h2 id="Kernel Command Line">Kernel Command Line<a class="headerlink" title="Permalink to this headline" href="#Kernel%20Command%20Line">¶</a></h2><p><code class="filename">systemd-backlight</code> understands the
following kernel command line parameter:</p><div class="variablelist"><dl class="variablelist"><dt id="systemd.restore_state="><span class="term"><code class="varname">systemd.restore_state=</code></span><a class="headerlink" title="Permalink to this term" href="#systemd.restore_state=">¶</a></dt><dd><p>Takes a boolean argument. Defaults to
"<code class="literal">1</code>". If "<code class="literal">0</code>", does not
restore the backlight settings on boot. However, settings will
still be stored on shutdown. </p></dd></dl></div></div><div class="refsect1"><a name="idm47204620943888"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>
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