The suspend/sleep/hibernate function is set as a default when in battery mode. Probably done deliberately so that they can claim it delivers the better than the other brand's battery life. But perhaps there are other esoteric features on laptops that allows for say, the BT function to work even when in suspend. I mean features like WOR (Wake-up On Ring), WOL (Wake-up On LAN), and so on which increases the promiscuity of a Laptop