Yeah, once you have all the information in one spot. Took me several hours to figure it out. Every thread about getting Vega working mentioned installed llvm-3.9, which is the default. But it did NOT work. So I had to do a bit of experimentation. The mesa stuff no threads I found mentioned that it needed to be updated, but no matter what I did with just the llvm-6.0, glxinfo would show amdgpu as unloaded. A couple threads mentioned that Vega won't work in older mesa versions, so I pulled a list of installed mesa packages, a list of what was in backports for mesa, and updated everything that was already installed that there were updates for. After rebooting, I was surprised to see it was working beautifully. Both the Lenovo and the Inspiron are having no issues now.
