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+.\" -*- nroff -*-
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+.Dd August 4, 2018
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+.Os GNU/Linux
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+.Dt LIGHT 1 URM
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+.Sh NAME
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+.Nm light
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+.Nd a program to control backlight controllers
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+.Sh SYNOPSIS
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+.Nm light
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+.Op Fl abcGhHkIlLmOprV
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+.Op Fl s Ar ARG
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+.Op Fl v Ar LEVEL
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+.Op Fl A Ar VAL
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+.Op Fl S Ar VAL
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+.Op Fl U Ar VAL
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+.Sh DESCRIPTION
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+.Nm
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+is a program to control backlight display and keyboard controllers under
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+GNU/Linux.
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+.Pp
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+.Bl -bullet -compact
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+.It
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+Operates independently of X (X-Window)
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+.It
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+Can automatically figure out the best controller to use, making full use
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+of the underlying hardware
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+.It
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+Supports a minimum cap on the brightness value, as some controllers set
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+the display to be pitch black at a vaĺue of 0 (or higher)
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+.El
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+.Sh COMMANDS
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+The following unique commands are supported:
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+.Pp
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+.Bl -tag -width Ds
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+.It Fl A Ar VAL
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+Add value
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+.It Fl G
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+Get value, default
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+.It Fl H , Fl h
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+Show help text and exit
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+.It Fl I
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+Restore brightness
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+.It Fl L
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+List controllers
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+.It Fl O
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+Save brightness
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+.It Fl S Ar VAL
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+Set value
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+.It Fl U Ar VAL
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+Subtract value
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+.It Fl V
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+Show program version and exit
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+.El
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+.Sh OPTIONS
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+The behavior of the above commands can be modified using these options:
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+.Pp
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+.Bl -tag -width Ds
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+.It Fl b
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+Set
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+.Fl S ,
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+Get
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+.Fl G ,
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+Add
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+.Fl A ,
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+or Subtract
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+.Fl U
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+active brightness, default
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+.It Fl k
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+Act on keyboard backlight
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+.It Fl l
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+Act on display backlight, default
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+.It Fl m
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+Get
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+.Fl G
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+maximum brightness
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+.It Fl c
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+Set
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+.Fl S
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+or get
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+.Fl G
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+minimum cap for brightness
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+.It Fl a
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+Select controller automatically, default
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+.It Fl p
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+Interpret input and output values in percent, default
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+.It Fl r
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+Interpret input and output values in raw mode
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+.It Fl s Ar ARG
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+Specify controller to use. Use
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+.Fl L
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+to list available controllers
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+.It Fl v Ar ARG
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+Set verbosity level, by default
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+.Nm
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+only outputs read values:
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+.Pp
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+.Bl -tag -width 0: -compact
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+.It 0:
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+Read values
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+.It 1:
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+Read values, Errors
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+.It 2:
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+Read values, Errors, Warnings
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+.It 3:
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+Read values, Errors, Warnings, Notices
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+.El
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+.El
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+.Sh AUTHORS
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+Copyright \(co 2014 Fredrik Haikarainen
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+.Pp
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+This is free software, see the source for copying conditions. There is NO
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+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
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Joachim Nilsson
vor 6 Jahren