Im on Android 5.1.1 , it was working but now it’s not. Im having this problem and it seems it’s software related to a service not starting. The light sensor in front works , because I put my finger in front and the navigation lights up/off on Note 4. Waiting a while then you hear the beep that it’s on / off (Light sensor) there is a delay or something wrong with the services that watch for this. I had a custom Rom that it always did this on. It was working great and must have installed something or changed a setting in start up… still trying to figure it out.
Ive been searching for weeks now. I did find this today; Maybe someone savvy can diagnose whats going on behind the scenes… https://docs.unrealengine.com/latest/INT/Platforms/GearVR/Debugging/