https://bugzilla.kernel.org/show_bug.cgi?id=200695
--- Comment #27 from John Doe (anode.dev@gmail.com) --- My RX550 is successfully booted up with 4.20 kernels and newer, but my OS freezes every minute for 30 secs if I open youtube or play game, and anything doesn't work upon freeze - I couldn't move mouse or press REISUB. Entire system is stuck. I downgraded kernel to 4.14 - and it works like a charm without lags/freezes/stucks. And it seems 4.14 doesn't have AMD DC (amdgpu.dc=0 doesn't work for me)