Assuming there is no security pin set, the USB charging cable is live and the "from any screen" OK Google setting is enabled, the Moto G will respond to "OK Google" even when the screen is asleep. So I can set timers etc. without laying a finger on it. I just purchased an HP 8 G2 tablet, and I can't get it to behave the same way. It refuses to switch on the screen. It clearly hears the "OK Google", but only brings up the "listening..." screen next time the screen is manually woken up via the lock button. 

Is there a way to make it work properly on the tablet?