Ryzen 3 3200g on msi x470 gaming plus board with 32gb ram, dvi display works fine but hdmi blacks out and goes off and on.
I am having the same problem. I have updated the bios and tried several versions of radeon vega 8 graphics drivers and none will stop the screen from flickering off for sometimes a second and others for more then 30 seconds.
the windows basic driver works for the video but then I lose the audio through the hdmi.
I have the Asrock B450m-hdv r4.0 motherboard and their tecs don't know if it is a MB issue or a ryzen problem. I will have to send them back the M-board to find out.
If your board is different, then it is probably a processor flaw. My G-force video card works fine but I did not buy this setup to have to run an exterior graphic card. Kind of defeats the whole purpose.
I had the same issue with my MSI 470 mb until the December update by AMD, Adrenalin video software. Current version is 28.2015015 1007 dated 1/17/20. Earlier versions would act up mostly at startup, the window driver worked the best but I don't use the HDMI for sound.
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