Christopher, I tested the daily build of Ubuntu 18.04 from your link and it
does not work - the problem is still there.
What I noticed, the daily build was based on kernel 4.13. I thought 18.04 will
be based on kernel 4.15 (Chris mentioned the problem is solved for him in this
particular kernel version).
** 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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