tune the backlight!
``` Change backlight brightness
brack [device] [change]
device (optional) the device to change backlight on (see /sys/class/backlight) change (optional) absolute value in percent or change in percent prefixed with +/-.
no change will display current value. no device will try to automatically determine device.
Examples:
brack +10 # increase brightness with 10% brack -10 # decrease brightness with 10% brack 50 # set brightness to 50% brack intelbacklight +10 # increase brightness with 10% on the intelbacklight device ```