HTC One M8 has various gestures but HTC does not provide the double tap to sleep gesture on the One M8 and I show you how to enable double-tap to sleep on HTC One 2014 using the app Knock Lock so that you don’t have to use the power button to make the phone go to sleep.
All of my other videos on the HTC One M8 (2014 Edition) http://www.youtube.com/playlist?list=PLtIc4giS3RKMf5lK3TqWA029yqqPC16m9
