Still no success, my laptop don't have sound controls on his front panel, instead the sound is controlled with Fn keys (F7 for volume down and F8 for volume up, and, F6 for muting, which also has a led indicator when the speakers are muted).
The weird fact is that after loading alsa.tcz, it turns on the led indicator at F6 key, and there is no way to turn it off, so in my understanding, the laptop is permanently "muted", that is why running the commands on the terminal don't do anything.