Created attachment 141508 [details]
Picture with the 3 monitors. The colors at the center one are wrong

I have a 3 monitors setup on a NUC8i7HNK (with latest BIOS: 0049).

I'm currently using Kernel 4.17 + DRM patches for 4.18-rc1. Everything works
OK. However, upgrading the Kernel to 4.18.5 (kernel-4.18.5-200.fc28.x86_64)
causes that the center (and default) monitor to mangle colors. The same issue
also happens with upstream Kernel 4.18 vanilla.

I'm enclosing a picture of what's happening there.