Today (in the morning) i have updated my Suse, after the reboot instead of the graphical login appears a X11 black screen. With CTRL+ALT+F1 i can log in textual mode and see the output of dmesg, seems that not all the NVIDIA packages are updated to the latest version. I found this solution (i hope it can to be useful for other user that have this problem), reinstall all NVIDIA packages already installed. After the reboot i had graphical login.