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-\input texinfo @c -*-texinfo-*-
-
-@c %**start of header
-@setfilename adjbacklight.info
-@settitle adjbacklight
-@afourpaper
-@documentencoding UTF-8
-@documentlanguage en
-@finalout
-@c %**end of header
-
-
-@dircategory Miscellaneous
-@direntry
-* adjbacklight: (adjbacklight). Convenient method for adjusting the backlight on your portable computer
-@end direntry
-
-
-
-@c @defindex op
-@c @synindex op vr
-@c @synindex cp pg
-
-
-@copying
-This manual is for @command{adjbacklight}.
-
-Copyright @copyright{} 2013, 2014 Mattias Andrée (maandree@@member.fsf.org)
-
-@quotation
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
-Texts. A copy of the license is included in the section entitled
-``GNU Free Documentation License''.
-@end quotation
-@end copying
-
-
-@ifnottex
-@node Top
-@top adjbacklight
-@insertcopying
-@end ifnottex
-
-@titlepage
-@title adjbacklight 7.1
-@subtitle Convenient method for adjusting the backlight on your portable computer.
-@author Mattias Andrée, maandree@@member.fsf.org
-@page
-@vskip 0pt plus 1filll
-@insertcopying
-@page
-@*@*
-@center `And sometimes the portable computers' adjustment keys arn't even wired to the hardware…'
-@end titlepage
-
-@contents
-
-
-@menu
-* Overview:: Overview of @command{adjbacklight}
-* Invoking:: How to start @command{adjbacklight}
-* Using:: How to use @command{adjbacklight}
-* Behind the scenes:: How @command{adjbacklight} works
-* License of adjbacklight:: Summary of the license of the program
-* GNU General Public License:: The license of the program
-* GNU Free Documentation License:: The license of this manual
-* Concept index:: Concept index
-@end menu
-
-
-
-@node Overview
-@chapter Overview
-@cindex overview
-@cindex description
-
-@command{adjbacklight} is convient method for adjusting the backlight on your
-portable computer. Depending on your computer, the details of @command{adjbacklight}
-differs.
-
-For some computers program will adjust the same parameters as the keys on your
-keyboard, one other computers this program will adjust an independent parameter
-allowing more detailed adjustment and may not be affected by the battery status
-change. One some computers the keys for the suns does not do anything and is
-expected to be binded by the OS, for thoses computers this may be the best choice
-if you are in the TTY.
-
-@command{adjbacklight} allows 0.5 % precision, assuming that the firmware allows
-at least that. If you want higher precision, it is simple to modify the source
-code. Just run @code{sed -i s/200/400/g src/adjbacklight.c}, if you want
-0.25 % precision.
-
-@cindex root
-@cindex video
-@cindex permissions
-To use @command{adjbacklight} you must either be root or be a member of the
-group `video'. The `video' membership requirement is artificial so you can rip
-that out from the code if you prefer, but the effective user must be `root'
-(EUID = 0) otherwise you will not have permission to use files in
-@file{/sys/class/backlight} unless you make your initialisation
-system give you access.
-
-
-
-@node Invoking
-@chapter Invoking
-@cindex invoking
-@cindex starting
-@cindex options
-@cindex arguments
-@cindex device
-@cindex selecting device
-@cindex interactive mode
-@cindex non-interactive mode
-@cindex @command{adjbacklight}
-@cindex @option{-c}
-@cindex @option{--copying}
-@cindex @option{--copyright}
-@cindex @option{-w}
-@cindex @option{--warranty}
-@cindex @option{-a}
-@cindex @option{--all}
-@cindex @option{-g}
-@cindex @option{--get}
-@cindex @option{-s}
-@cindex @option{--set}
-
-@command{adjbacklight} can be started with @option{-c}, @option{--copying} or
-@option{--copyright} for displaying copyright information, @option{-w} or
-@option{--warranty} for displaying a warranty disclaimer.
-
-To actually use the program, just execute @command{adjbacklight} without any
-arguments, or with @option{-a} or @option{--all} to not limit the devices to
-those that are not ACPI video devices. Alternatively you can list the devices
-either by full path or just the name in the directory @file{/sys/class/backlight}.
-
-If you do not want to run in interactive mode, you can use the option
-@option{-g} or @option{--get} to get the average backlight of all devices
-selected by the arguments (as in interactive mode), the value will be
-printed percents with no whitespace between the value and the percent,
-the value will be formated in the traditional computer format, only 0-9
-with one dot (.) for separation of the integer part and the decimal part
-(which will be two digits.) If you want to set the backlight there are
-a few ways to do this: @option{-s} or @option{--set} followed by a value
-or the value directly but with a prepending `=' if it does not start with
-`+' or `-'. This argument is formated similar to the value printed by
-@option{--get}, except it may end with zero, one, or two percent signed.
-`+' is used for increase in brightness, `-' for decrease. Zero percent
-signed is used for a raw value, one percent signed is used for a cooked
-value that is usable on all backlight devices, and two percent signed
-is used for a value relative to the current value.
-
-Assume the current backlight is 50 (25 %) on a device and the maximum is
-200. @code{+25} will set it to 75 (37,5 %) and @code{-25} will set it to
-25 (12,5 %). @code{+50%} will set it to 75 % (150), @code{-50%} would
-set it to -25 % (-50) but because that is not within the accepted value
-range it will be truncated to 0. @code{+100%%} will set it to 100 (50 %),
-that it 200 % of the current brightness, @code{-50%%} will set it to
-25 (12,5 %), that is 50 % of the current brightness. For the following
-formats the `=' is optional if @option{-s} or @option{--set} is used.
-@code{=150} will set the brightness to 150 (75 %), @code{=50%} will set
-it to 50 % (100), and @code{=200%%} will set it to 100 (50 %), that is
-200 % of the current brightness.
-
-
-
-@node Using
-@chapter Using
-@cindex interactive mode
-@cindex usage
-@cindex keyboard
-@cindex darken screen
-@cindex brighten screen
-@cindex quit
-@cindex exit
-@cindex close
-@cindex next screen
-
-When you run @command{adjbacklight} in interactive mode, the following
-keys are used to adjust the backlighting:
-
-The @kbd{left} and @kbd{down} arrow keys are used to darken the screen.
-The @kbd{right} and @kbd{up} arrow keys are used to brighten the screen.
-@kbd{q}, @kbd{enter} and @kbd{<control>d} continues to the next backlight
-controller, or if you are at the last one, exits the program.
-
-
-
-@node Behind the scenes
-@chapter Behind the scenes
-@cindex behind the scenes
-@cindex inner workings
-
-On normally configured Linux systems, the kernel mounts a virtual
-partition on @file{/sys}. If you have screens using backlight,
-you should find backlight device in @file{/sys/class/backlight}.
-These devices are directories containing control files which you
-can read the current values from or write to (perhaps using @command{echo})
-to modify the value. In a directory in @file{/sys/class/backlight}
-you will find @file{brightness} and @file{max_brightness}.
-Just read from @file{max_brightness} to get the maximum allowed integer
-value in @file{brightness}, the minimum value is 0.
-
-
-
-@node License of adjbacklight
-@appendix License of adjbacklight
-@flushleft
-adjbacklight – Convient method for adjusting the backlight on your portable computer
-
-Copyright © 2012, 2013, 2014 Mattias Andrée (maandree@@member.fsf.org)
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
-@end flushleft
-
-@node GNU General Public License
-@appendix GNU General Public License
-@include gpl.texinfo
-
-@node GNU Free Documentation License
-@appendix GNU Free Documentation License
-@include fdl.texinfo
-
-@node Concept index
-@appendix Concept index
-@printindex cp
-
-@c @node Concept and program index
-@c @appendix Concept and program index
-@c @printindex pg
-
-@c @node Variable and option index
-@c @appendix Variable and option index
-@c @printindex vr
-
-
-@bye
-