https://bugzilla.kernel.org/show_bug.cgi?id=201539
--- Comment #73 from Alex Deucher (alexdeucher@gmail.com) --- (In reply to MasterCATZ from comment #72)
now if someone could solve the issue when it uses more power when running multiple displays ( exactly the same monitors res / hz ) I can run the card single display under 10 watts plug in another display and its over 50 watts idle
You can enable mclk switching with identical monitors by setting amdgpu.dcfeaturemask=2 It's enabled by default in 5.11.