Under System Preferences -> Energy Saver -> Power Adapter, there is an option for "Prevent computer from sleeping automatically when the display is off" However, such option is NOT available in "Battery". The problem is, when I am using battery on my MBPr (unplugged from power), when the display if automatically turned off, the machine always go to Suspend state. This will "kill" whatever process I am running. Is there a way to prevent this from happening? I recall in Maverick this behavior did not happen.