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
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