Gyroscope on windows phones. Enabled but no working

Hi everyone, I'm trying to use the gyroscope on my lumia 920 but without success.

In order to test it i made an extremely simple scene with t$$anonymous$$s only t$$anonymous$$s script attached to the camera:

 using UnityEngine;
 using System.Collections;
 
 public class Gyro : MonoBehaviour {
 
     private bool gyroBool;
     private Gyroscope gyro;
     private Quaternion rotFix;
     private Vector3 initial = new Vector3(90,180,0);
     
     // Use t$$anonymous$$s for initialization
     void Start () {
         Screen.orientation = ScreenOrientation.LandscapeLeft;
         Screen.sleepTimeout = SleepTimeout.NeverSleep;
         
         gyroBool = SystemInfo.supportsGyroscope;
         
         Debug.Log("gyrobool " + gyroBool.ToString());
         
         if (gyroBool)
         {
             gyro = Input.gyro;
             gyro.enabled = true;
             
             rotFix = new Quaternion(0,0,0.7071f,0.7071f);
         }
         else
         {
             Debug.Log("no gyro support");
         }
     
     }
     
     // Update is called once per frame
     void Update () {
         if (gyroBool)
         {
             Debug.Log (gyro.enabled);
             var camRot = gyro.attitude*rotFix;
             transform.eulerAngles = initial;
             transform.localRotation *= camRot;
             Debug.Log(gyro.attitude);
         }
     }
 }

The log shows me that gyro is enabled, but the result of the attitude is Always 0 no matter how the phone is positioned.

I'm sure the gyroscope of the phone is working because i made also a simple app in visual studio 2012 following t$$anonymous$$s guide https://msdn.microsoft.com/en-us/library/windows/apps/hh202943%28v=vs.105%29.aspx and it works nicely.

Where I am wrong? just to be sure i tried to build with both unity 4.6 and the new unity 5, but no differences