imac pro - Vega - Assasins Creed Origins does not start.

I downloaded the adrenalin 18.2.1 from the site (IMac pro, so no 18.2.2 yet).

I installed as described (I think) and ran the Radeon Settings Installer afterwards.
The display adapter in device manager is now a "Radeon RX 580 Series" , with driver 23.20.15017.3010.


Starting AMD Radeon Pro and AMD FirePro settings (I don't see adrenaline settings, but it is not clear what I should expect from running "Radeon Settings Installer) I see the following information:

Versie van Radeon Pro- en AMD FirePro-instellingen - 2018.0131.1849.33856

Versie stuurprogrammapakket - 17.50.17.03-180131a-323782E-RadeonSoftwareAdrenalin

Aanbieder - Advanced Micro Devices, Inc.

Versie 2D-stuurprogramma - 8.1.1.1634

Direct3D® Version - 9.14.10.01316

OpenGL® Version - 6.14.10.13506

OpenCL™ Version - 23.20.15017.3010

AMD-geluidsstuurprogrammaversie - 10.0.1.1

Vulkan™ Driver Version - 2.0.1

Vulkan™ API Version - 1.0.65



I am unable to start Assisins Creed Origins. There is a splash screen that stays in the middle and a second blank window appears but nothing else happens.
Can I do somethings to generate logs / dumps to help out ?