You can do this test when you're in a room with plenty of light 1. pull down the notification panel so you can see the light bar. 2 Cover the light sensor and lower the brightness bar 3. Remove your hand The brightness bar should increase. You can double check with an app like devcheck that your device is not constantly reporting 0 lux. That means something is wrong. https://play.google.com/store/apps/details?id=flar2.devcheck&hl=en
