Intel Backlight

Ruby Gem for setting screen backlight brightness with intel based backlight controllers on linux.

Simply run:

$ gem install intel-backlight

This script can be run as root. Alternatively, you can change the mode of the /sys/class/backlight/intel_backlight/brightness file from 644 -> 664 and change the owner from root:root -> root:GROUP where GROUP is a group your user is a part of. Personally, I used the adm group. This will allow you to run the script without root (useful for binding to keyboard shortcuts).

# Returns the current brightness
$ backlight
=> 40

# Sets brightness to 50%
$ backlight 50
=> 50

# Increases brightness 10%
$ backlight +10
=> 60

# Decreases brightness 15%
$ backlight -15
=> 45

# Brightness maxes at 100 (and mins at 0)
$ backlight 120
=> 100

All configurations are done through the core Settings object:

config = Backlight::Settings.new

You can set/get percentage brightnesses via:

config.set(90)
config.get
=> 90

Optionaly, you can set the output file, or the file which sets the maximum value via either:

config = Backlight::Settings.new(output = ..., max = ...)
config.output(file = ...)
config.max(max = ...)

You can also use the max method to manually force a maximum integer value for the brightness, rather than reading the value from a file.

You can run rake, which will build the gem, build the documentation into the doc/ directory, and run the tests & style checker.