How do you know if fast dormancy is working, or rather is disabled properly, on Android? (or perhaps the opposite, ensuring it's enabled).
Does it have anything to do with data dropping from H to 3G? This shows as network type HSDPA:9 then dropping to UMTS:3.
How do you ensure its disabled, when it seems different for each device? Samsung seems to have their own way of toggling it. As does LG, per carrier in a sqlite database. But that doesn't exist on my Nexus 4.
So I tried a build.prop edit:
But I'm not sure if this does it.