Hi , almost same problem for me, but with a Note 9 Exynos and a HP Elite X3 Lap Dock Serial starting with Y. I've tried three different cable, but some are saying that there is an uncompatibility between Exynos and some HP Lap Dock. I have a message saying "HDMI cable problem", so still think that I'm possibly using an USB C cable with the wrong compatibility. Writing this on my HP Elite X3 lap dock connected to my former Lumia 950 XL. So, as my Note 9 is working perfectly with my Microsoft HD-500 continuum dock, I think that there should be something wrong, but what?
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