https://bugzilla.kernel.org/show_bug.cgi?id=201139
--- Comment #5 from Harry Wentland (harry.wentland@amd.com) --- It looks like link training failed. Can you check on your monitor's OSD whether DisplayPort or Auto is selected as input? I've seen this behavior on some monitors when Auto input was selected. If so try selecting the DP input and see if that helps.