92 lines
2.4 KiB
HTML
92 lines
2.4 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of <A HREF="mailto:SYSTEMD-BACKLIGHT@.SERVICE">SYSTEMD-BACKLIGHT@.SERVICE</A></TITLE>
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</HEAD><BODY>
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<H1><A HREF="mailto:SYSTEMD-BACKLIGHT@.SERVICE">SYSTEMD-BACKLIGHT@.SERVICE</A></H1>
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Section: <A HREF="mailto:systemd-backlight@.service">systemd-backlight@.service</A> (8)<BR>Updated: <BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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<A HREF="mailto:systemd-backlight@.service">systemd-backlight@.service</A>, systemd-backlight - Load and save the display backlight brightness at boot and shutdown
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<P>
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<A HREF="mailto:systemd-backlight@.service">systemd-backlight@.service</A>
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<P>
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/lib/systemd/systemd-backlight
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<P>
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<A HREF="mailto:systemd-backlight@.service">systemd-backlight@.service</A>
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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
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/var/lib/systemd/backlight/. During loading, if the udev property
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<B>ID_BACKLIGHT_CLAMP</B>
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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.
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<A NAME="lbAE"> </A>
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<H2>KERNEL COMMAND LINE</H2>
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<P>
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systemd-backlight
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understands the following kernel command line parameter:
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<P>
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<I>systemd.restore_state=</I>
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<DL COMPACT><DT id="1"><DD>
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Takes a boolean argument. Defaults to
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"1". If
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"0", does not restore the backlight settings on boot. However, settings will still be stored on shutdown.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<P>
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<B><A HREF="/cgi-bin/man/man2html?1+systemd">systemd</A></B>(1)
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="2"><A HREF="#lbAB">NAME</A><DD>
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<DT id="3"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="4"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="5"><A HREF="#lbAE">KERNEL COMMAND LINE</A><DD>
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<DT id="6"><A HREF="#lbAF">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:16 GMT, March 31, 2021
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</BODY>
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</HTML>
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