My rig was running fine for months without hdmi dummy plug and after Windows 10 updated to version 1709, it stopped.
First gpu started to hash 0 mh/s so I had to buy cheap hdmi dummy plug.
After I pluged it in, it works fine now.
I was wondering, how come gpu could work without hdmi dummy plug before, and after windows updated it can only run with hdmi dummy plug?
I used same drivers before and after windows update.
Gpus are rx 470 4gb.
i am wondering if you have ever got an answer for your question?
because i also face the same issue
few rigs run perfectly well for one year, and after some windows updates they require this plug
why is that? and how can i make it to work just like it did for a whole year without having to buy 15 dummies for 15 rigs?
uninstalling the update will not help, because windows will reinstall it FORCEFULLY without asking for your permission, even when you have Windows Pro (you can disable it ONLY for 30 days)