I solved loading a live pen with Ubuntu and commenting the Driver line in the xorg.conf file and then I installed the last version of the drivers from the AMD/ATI site. And leaving disabled the driver in the "Hardware Drivers"
I solved loading a live pen with Ubuntu and commenting the Driver line in the xorg.conf file and then I installed the last version of the drivers from the AMD/ATI site. And leaving disabled the driver in the "Hardware Drivers"