Ubuntu 17.10 with kernel 4.16-rc1, radeon.mst=1, extended display in
GUI.

The screens chained by MST DisplayPort are seen properly as separate
screens. Build screen is seen in the GUI and although enabled there,
remains blank. Periodically (~5s) screens become blank for ~1s.

** Attachment added: "journal_mst.log"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1509997/+attachment/5054162/+files/journal_mst.log

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https://bugs.launchpad.net/bugs/1509997

Title:
  1002:6821 Graphical issues when radeon MST enabled

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