I've tried Settings | Developer Options | Stay awake plus a couple of apps that claim to control StayAwake, but the setting always gets cleared with a re-boot.
Does anybody know a way to make StayAwake persist such that the screen never goes to sleep as long as the device is getting external power - but goes to sleep once power is removed?
Does anybody know a way to make StayAwake persist such that the screen never goes to sleep as long as the device is getting external power - but goes to sleep once power is removed?