openSuse 12.1 freezes with NVIDIA drivers

Hi there!
I installed opensuse 12.1 (clean installation) and every was fine.
I have a Geforce FX 5500 graphic card installed in my equipment.

The problem started when I installed the drivers from NVIDIA by “easy way”, with 1-click-install (http://en.opensuse.org/SDB:NVIDIA_drivers): a repo (ftp://download.nvidia.com/opensuse/12.1/) and “nvidia-gfxG01-kmp-default” and “x11-video-nvidiaG01” packages were installed on my system.
Also the file “/etc/modprobe.d/nvidia.conf” was added, with “blacklist nouveau” written.

After that, the system freezes (seemingly) after login screen, and never end of start up. Only failsafe mode works properly.
When the system freezes (seemingly), if I get a console (by clicking Ctrl+Alt+F1), after login screen, I see that a message is printed out every second, saying:

serial8250: too much work for irq16

I tried with and without “nomodeset” option, “NO_KMS_IN_INITRD=yes” and “NO_KMS_IN_INITRD=no”, and so on, but the same condition parsists.

Do you have any idea?

Thank you, so much.