I do not use any sort of security on my phone (No judgement, please! It's just the way I do things) My Galaxy S6 just got updated with Marshmallow and now when I turn on my screen by pushing the power button, there's a fade-on sort of effect instead of just popping on. (First-world problems, right?) I can't figure out how to stop it from doing that and I'm usually pretty good about figuring these things out. Thanks in advance for your help!