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50 lines
2.1 KiB
Groff
50 lines
2.1 KiB
Groff
'\" t
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.TH "SYSTEMD\-BACKLIGHT@\&.SERVICE" "8" "" "systemd 219" "systemd-backlight@.service"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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systemd-backlight@.service, systemd-backlight \- Load and save the display backlight brightness at boot and shutdown
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.SH "SYNOPSIS"
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.PP
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systemd\-backlight@\&.service
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.PP
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/usr/lib/systemd/systemd\-backlight
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.SH "DESCRIPTION"
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.PP
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systemd\-backlight@\&.service
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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 udev property
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\fBID_BACKLIGHT_CLAMP\fR
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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\&.
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.SH "KERNEL COMMAND LINE"
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.PP
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systemd\-backlight
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understands the following kernel command line parameter:
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.PP
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\fIsystemd\&.restore_state=\fR
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.RS 4
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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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.RE
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.SH "SEE ALSO"
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.PP
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\fBsystemd\fR(1)
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