I have a notebook Dell Vostro 3550 (Intel3000/AMD RADEON HD 6630M)

I use Ubuntu 12.04 Unity, with AMD Catalyst 12.10 driver. The problem is, after playing any 3D game in full screen, after exit the game the screen starts flickering and the logout is the only thing which is solve the problem. There is no problem while playing the game.

I tried many window manager (KDE, XFCE, LXDE) I tried Ubuntu 12.10, the problem is the same. I use Kernel 3.6.6.

Can some help me?