My HTC One seems to vibrate for every damn notification that comes on. When it does this, the screen does not come on and there's no sound. I know how to turn notifications off, but I"m trying to figure out how define when a notification :
a) Turns on the screen so I can see the notification without having to turn the phone on, go to the notifications screeen, etc.
b) Provides a audio notification / tone
c) Does or does NOT vibrate
Personally, I find the vibrate with no sounds and no screen to be the most annoying.