Tab and arrow keys freezes my computer

Hello everybody:
I've updated my system this weekend (kernel packages). And when i rebooted the laptop freezed in gdm login manager.
I've stopped gdm.
Now ,in console, when i log in, i can work well but if i press tab or the arrows the system freezes and i only can press the power button.
Any help?

I meant that the laptop freezes in gdm and in console (tty1). In gdm i can't even type any character. And in console i can login but when i press the tab key (autocompletation) it stops. The only thing i can do is press the power button.
Actually my keymap is es_ES. And i think that it's working fine because the n tilde and pipes work fine.

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