Will El Capitan allow me to daisy chain two Dell 2713H monitors from my 2015 13" MBP? Both monitors support DisplayPort 1.2. Currently if I attempt this my monitors become a new desktop, but they are mirrored. Unable to get the 2nd monitor detected by OS X. Previous research on this topic shows that my MBP technically supports the technology by OS X does not. Anyone know if El Capitan will enable this?