video corruption with amd RX560 and 2k display

When using wayland, I get a lot of video corruption on my 2k display. It usually shows up as bands of the background image or gnome-shell status bar flickering across the display at different vertical positions. There is a Fedora bug with a similar problem and video: https://bugzilla.redhat.com/show_bug.cgi?id=1417778

WORKAROUND: Select 'Gnome under X.Org' from the login screen instead of wayland.

I have created this bug in launchpad: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1740484

One of the answers is this one: "If the bug is specific to "Wayland" sessions then this is a bug in the 'eglnative' backend of package 'mutter' (used by gnome-shell)."