#!/bin/bash

CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk '{print $2}')


case "$CURRENT" in

100)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
;; 
87)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
;;
75)
echo -n 87 > /proc/acpi/video/VGA/LCD/brightness;
;; 
62)
echo -n 75 > /proc/acpi/video/VGA/LCD/brightness;
;; 
50)
echo -n 62 > /proc/acpi/video/VGA/LCD/brightness;
;; 
37)
echo -n 50 > /proc/acpi/video/VGA/LCD/brightness;
;; 
25)
echo -n 37 > /proc/acpi/video/VGA/LCD/brightness;
;; 
12)
echo -n 25 > /proc/acpi/video/VGA/LCD/brightness;
;; 
*)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness ;
;;
esac