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.Dd September 7, 2018
.Dt BRI 1
.Os
.
.Sh NAME
.Nm bri
.Nd backlight brightness control
.
.Sh SYNOPSIS
.Nm
.Op Ar brightness
.Nm
.Cm +
.Nm
.Cm -
.
.Sh DESCRIPTION
.Nm
controls the backlight brightness on Linux.
.
.Pp
With no argument,
the current brightness is printed.
With a numerical
.Ar brightness
argument,
the brightness is set.
.
.Pp
The
.Cm +
and
.Cm -
arguments
may be repeated any number of times
and adjust the brightness
in increments of 16.
.
.Sh FILES
.Bl -tag
.It Pa /sys/class/backlight
Files under the first subdirectory found
are used to control the backlight brightness.
.El
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