Input.acceleration is not working on tablet

I am using Input.acceleration on a Lenovo A1107 device (android). It constantly shows 0 on X and 0 on Y. Anyone have any ideas why this is happening?

GUILayout.Label("Y: " + Input.acceleration.y); GUILayout.Label("X: " + Input.acceleration.x);

shows 0 only on Lenovo, other android devices work. And the lenovo has an accelerometer as well as other games i have downloaded with accelerometer work.