I have tried Ubuntu 17.10 with the upstream kernels (4.15.2 and 4.16-rc1) and 
both behave similarly:

no kernel parameters: screens chained by MST DisplayPort mirror picture,
visible as a single screen

radeon.mst=1 : screens chained by MST DisplayPort  work properly (seen
as separate screens), build screen doesn't work

radeon.mst=1,radeon.dpm=1 : subsequentely flickering screens, not usable

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Incomplete => Confirmed

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  1002:6821 Graphical issues when radeon MST enabled

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