I have a Note 4 running 6.0.1 that I recently reflashed back to stock in an attempt to fix issues I was having.
Now, whenever I enable Power Saving mode, it populates my notification list with a giant notification that takes up half the screen:
I remember this happening when I first upgraded to Marshmallow, but at some point I did something that compacted the notification down to just the "turn off" button.
I don't care about having a little notification at the top, but all the "Your device performance is limited..." text is annoying.
Does anyone know what I might have down to fix this before? I'm pretty sure nothing I did was "hackish", and I didn't disable System UI notifications altogether since I still had the small one when Power Saving was enabled.