Ubuntu 17.10 with kernel 4.16-rc1, no kernel parameters, extended
display in GUI.
The screens chained by MST DisplayPort mirror the view and are visible
as a single screen. Build screen is seen as a second screen and works.
No picture blinking.
** Attachment added: "journal_no_param.log"
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1002:6821 Graphical issues when radeon MST enabled
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