Ubuntu 17.10 with kernel 4.16-rc1, radeon.mst=1, extended display in
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"
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1002:6821 Graphical issues when radeon MST enabled
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