South Island (Hainan) and Sea Island (Kaveri) functional with RADV
Running Fedora 28 Design Suite post beta shows a nice surprise: Vulkan with RADV is fully functional on both South Island (Hainan) and Sea Island (Kaveri) cards on ASUS X550ZE laptop. amdgpu driver is needed to enable the feat in combination of boot parameter (cik.amdgpu_support=1 cik.radeon_support=0 si.amdgpu_support=1 si.radeon_support=0)
Vulkan smoketest running on RADV
Some minor issues need be to addressed like occasional glitches. Otherwise the performance is stable enough for dail use.
Replacing the 1TB 7200rpm HDD with a well reviewed Samsung 860 EVO 1TB HDD turned out a drastic improvement in term of speed caught me by surprise.
Noticeable effect was the nearly five seconds boot straight to the login screen and the response time of opening and closing applications. Envy x360 Ryzen 5 feels snappy now.
On a side note, Windows 10 has a nice app called Windows Hello to authenticate with face similar to facial recognition founds on Android device. A similar open source application called howdy is available but not packaged for Fedora yet.