Handling Notifications - Vibrations / Screen / Tones? 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

http://www.reddit.com/r/htc/comments/2w3op7/htc_one_m8_lollipop_notification_constant/