amdgpu is now the default driver loaded for AMD GPUs, for Vega's it's the only choice.
Fedora ("Fedora Xfce Live x86_64 28_Beta" torrent) installs xorg-x11-drv-ati and xorg-x11-drv-nouveau and xorg-x11-drv-intel and lots of other things but NOT xorg-x11-drv-amdgpu for some reason. This makes Xorg work badly using the ati driver instead of amdgpu. This causes problems. Some are very bad such as your monitor goes into suspend and X crashes and now you're doomed.
I'm not a linux scientist so it took me a while to realize the cause of pain was no xorg-x11-drv-amdgpu because I blindly assumed it had been installed automagically.
Please make sure the Fedora installer grabs xorg-x11-drv-amdgpu of xorg is installed (or I can just leave it in a script I personally run first thing after a fresh install anyway and everyone else gets bad bugs).
Thank you for reading all of this.
Adding xgl-maint for comment...
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