U2515H MST/Daisy Chain on Ubuntu 15.10

Hello,

I want to daisy chain 2 dell u2515h monitors through the displayport.

I am running ubuntu 15.10 with kernel 4.2.0-23 (currently latest)
HW: Skylake processor/onboard gpu with H170m mainboard chipset.

It runs fine on Windows 10 with graphics driver update.

On Ubuntu when I enable DP 1.2 option the screens go blank and computer gets stuck
They run fine when 1 is on displayport and 1 is on hdmi

Any suggestions?