Comment 3 for bug 996489

On Origen Android 12.05 Google Hangout release build:

https://android-build.linaro.org/builds/~linaro-android/origen-hangout-demo-12.05-release/#build=1

After the board reaches the sleep time - 15 seconds, the LCD screen is still lighting. In this condition, if click the "Back" hard key on board, then it will return to the screen lock screen, user can unlock the screen there.