have you tried the Leshcat's modded driver for AMD and Intel GPU's ??
give these drivers a try, might help.
Some news about my problem. So, it's fixed.
It seems to be te driver of my RADEON card witch wasn't correct. I dont know why.
So, to fix it I've contacted Samsung (my laptop is a Samsung) in order to have te good drivers. They have a software called SWupdate where all there computers drivers are referenced. I download the graphic one and it seems to work.
Thank you for your help guys