“Double tap to wake” was a proposed feature for Nexus 6, but Google dropped this feature in the final build, may be due to its play up nature. However, Nexus 6 users can enable this awesome screen-unlocking feature manually or via a simple app called “Nexus 6 Double tap To Wake”. Both methods require a rooted Nexus 6.
Before enabling the “Double tap to wake” on your Nexus 6, you might want to know what this feature is. This feature is similar to LG’s “Knock Code”, which makes it awesomely simple to unlock your device by just double tapping the screen. That is, you can use double tap as a substitute for using the unlock key to wake up your phone.
The “Nexus 6 Double Tap to Wake” app makes it super easy to enable “Double tap to wake” feature on your Nexus 6. The app is very simple to use. Just install the app, tap “Activate” button. As I told above, to enable the “double tap to wake” feature, your Nexus 6 should be rooted. Advanced users can enable this feature manually by editing a system file (/sys/bus/i2c/devices/1-004a/tsp) by using any root explorer app.
The Nexus 6 Double Tap to Wake is not a free app on Play Store. However, the developer provides the app free at this XDA thread. If you would like to donate the developer, purchase ($1) the app from Play Store.