Adrian:

1) Presently, to test 4.15 in http://cdimage.ubuntu.com/daily-
live/current/ you would have to install it (not test a live environment)
and enable the Proposed repository.

An alternative is test the latest upstream kernel (now 4.16-rc1) via
https://wiki.ubuntu.com/Kernel/MainlineBuilds .

2) To clarify, if you remove all non-default kernel parameters below is the 
screen glitches present:
radeon.dpm=1
radeon.mst=1

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Confirmed => Incomplete

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

Title:
  1002:6821 Graphical issues when radeon MST enabled

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