Man page - light(1)
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Manual
UNTITLED () LOCAL UNTITLED ()
NAME
light β a program to control backlight controllers
SYNOPSIS
light [ OPTIONS ] [ VALUE ]
DESCRIPTION
light is a program to control backlight display and keyboard controllers under GNU/Linux.
β’
Operates independently of X (X-Window)
β’
Can automatically figure out the best controller to use, making full use of the underlying hardware
β’
Supports a minimum cap on the brightness value, as some controllers set the display to be pitch black at a vaΔΊue of 0 (or higher)
COMMANDS
The following unique commands are supported:
-H , -h
Show help text and exit
-V
Show program version and exit
-L
List available devices
-A
Increase brightness by value
-U
Decrease brightness by value
-S
Set brightness to value
-G
Get brightness, default
-N
Set minimum brightness to value
-P
Get minimum brightness
-O
Save current brightness
-I
Restore previously saved brightness
OPTIONS
The behavior of the above commands can be modified using these options:
-r
Interpret input and output values in raw mode
-s PATH
Specify device target path. Use -L to list available devices
-v LEVEL
Set verbosity level, by default light only outputs read values:
0:
Read values
1:
Read values, Errors
2:
Read values, Errors, Warnings
3:
Read values, Errors, Warnings, Notices
FILES
When run in its classic SUID root mode light caches settings and current brightness in /etc/light . In its non-privileged mode of operation the Λ/.cache/light directory is used instead.
AUTHORS
Copyright Β© 2012-2018 Fredrik Haikarainen
This is free software, see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE GNU/Linux August 4, 2018 LIGHT (1)