Ubuntu 17.10 with kernel 4.16-rc1, radeon.mst=1 radeon.dpn=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_dpm.log"

** 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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