HP G7-2238nr Display :: How To Disable Auto Brightness Using Windows 8

This auto brightness problem is been bothering me for a long time now, and i can't find any fix for it at all. The display goes: 

- Bright  when having on screen a white web page, document, picture  
- and it display dims down when having on screen a dark web page/ document or picture

Note 1: I changed the settings and Turn off Auto Brightness in windows 8 advanced power plan settings .
 
Note 2: I tried to go disable the AMD  Vari-Bright but the windows 8 AMD catalyse control center, but it doesn't have that option to turn in off .
 
Note 3: I did disable the Sensor Monitoring Service in services.msc menu .. but still didn't do the trick :/ 
  
Note 4: I did disabled Intel Display Power saving Technology in intel's graphic and media Control Panel and .. with all this, still, the auto brightness problem isn't solved :/ 
  
Now .. what to do, with all this attempts and still can't get rid of it, i start losing hope i can use my laptop without the screen changing brightness on its own, watching a movie and browsing the web with the screen flickers to adapter to the background....