What have you tried so far - Xorg-7.7, Xorg-7.7-3d, nouveau kernel drivers, etc and what happened?
Thanks a lot for the help. I'm not very familiar with TinyCore (actually I'm not very faimiar with linux on desktop, usually I just use a remote terminal). Apparently I was installing the wrong packages. After installing:
firmware-nvidia.tcz
graphics-6.1.2-tinycore64.tcz
nouveau-6.1.2-tinycore64.tcz
Xorg-7.7.tcz
Xorg-7.7-3d.tcz
The nouveau driver is now working properly again.
Taking advantage of the help, I would like to have some help on the keys and on the audio.
I installed the kmaps package and added kmap=qwerty/br-abnt2 in grub.cfg, but that wasn't enough to change the keyboard layout, what could I do?