Christopher:
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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https://bugs.launchpad.net/bugs/1509997
Title:
1002:6821 Graphical issues when radeon MST enabled
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