@Eden I think wendell was running the RC version of the 4.15 kernel, which isn’t exactly suitable for beginners to do
Not an expert but isn’t, RX Vega support (Official Support) supposed to come with Kernel 4.15, which is still (RC) release candidate ? so unless you want to compile it yourself or try the rc version (Which i wouldn’t recommend for beginners)
through phoronix or something, i guess you’ll have to wait a little for the official release of kernel 4.15 which is supposed to come with freesync support and more. Not sure if there is an official release date on the Kernel release yet, it should be a massive update for AMD in general from what i’ve read