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.
This worked for me on my HTC One M8
First Go to Settings, then go to Accessibility, and click Notification Reminder to Off
First, make sure you have priority interruptions only. You can change your priorities here.
(Click image to enlarge)
You can also disable notifications, so your phone won't buzz.