I just bought a LG G4 H815 and using marshmellow. It seems my phone does not wake up while locked in any way while i am in a dark room or low light room. I have tried everything and it seems it only wakes up when I plug in the charger and then i can put in the pattern to unlock the phone. Otherwise it won't even wake up. I have seen some other users are also facing the same problem. Is there anyone who is facing the same problem ? Has anyone solved this ? TIA.