Arduino Yun, node.js and serial

I'm trying to bypass Bridge library and read serial directly from nodejs. I'm on the last sys upgrade (1.3) I have correctly installed nodes and serial module via opkg install. I have also commented out the line in the /etc/inittab:

#ttyATH0::askfirst:/bin/ash --login

This is my arduino code:

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("dudee");
  delay(100);
}

This is my node.js code:

var SerialPort = require("serialport").SerialPort
var serialPort = new SerialPort("/dev/ttyATH0", {
    baudrate: 9600,
    dataBits: 8,
    parity: 'none',
    stopBits: 1,
    flowControl: false
}, false);

console.log("hello");

serialPort.on("open", function () {
    console.log('open');
    serialPort.on('data', function(data) {
        console.log('data received: ' + data);
    });
});

serialPort.on('error', function(err) {
    console.log('error: '+err);
});

serialPort.open();

If I ssh to yun and run the script I don't see any "dudee":

~/test# node serial.js
hello
open

While if I open the serial monitor I see it.

If I run the node script on my computer (changing the right serial port name) everything works nice and I see the dude..

What can it be?