Take out your ipad and turn off the orientation lock if its on. Place it in front of you so that the home button is facing you. Now tilt it to the left so that the orientation switches, then tilt it again to the right.
For some reason, I have to tilt it about 45 degrees to the left before it switches orientation. When tilting to the right however, it only takes about 10 degrees. Is my accelerometer broken, or is this just the way it's designed?