Same problem here (RX 480, Win10). I've clean installed the newest driver, and got always the same problem. With driver version 21.19.407.0 (non-whql-win10-64bit-radeon-software-crimson-relive-16.12.2-dec19.exe), it is working fine, so seems the newest driver introduced this problem...
Hello, I am also having an issue with this... as are many others, please see links below. It looks as though most people are rolling back their drivers as a temporary fix, hopefully AMD will sort this in the next driver release though.
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My advice is - just use last stable for you driver version.There is no significant performance boost from driver to driver. Especially for old GPUs.
Update only if you need some new game(or any new features like ReLive) support or your driver is really old (6 month and more)
Also you can submit a report here
Lots of people on ESO have reported this which is why I didn't upgrade to optional 17.2.1
But I now see this is the stable version