Freesync is still broken on 18.3.4 with an XFX 580 8gb and a Nixeus Edg27 monitor over DP1.2.
The windmill demo freesync doesn't work (hz cycles between 30hz and 144hz) and is strobing heavily. On the g-sync demo freesync works (how ironic) but there is a lot of strobing. In game (PUBG) freesync does not work. All of this works perfectly in 17.11.4
Time to get your act together AMD. This has gone on far too long. Also stop telling us it's fixed in Patch Release Notes when it clearly isn't.