I updated my drivers to 19.1.1 but it still says "virtual super resolution not supported". It was working before but for the last three driver updates it's broken. I have Sapphire rx 580 8gb Nitro+ and a fx 8320 and i use my 4k tv( Philips pus6501) as a monitor.
The LG 42LA6678-ZB with ASUS Vega 64 and also with MSI Radeon 290 I have the same problem. With version 17.7 of Windows 10 Pro 64bit, it still works. Later versions will not work on both cards anymore.