Turned my PC on today (R5 3600, RX 5700, 16GB RAM, 1TB M.2 SSD, LG 4k/60 monitor) and the highest resolution I can get is 1600x900.
I updated to the latest Adrenalin 20.1.2 but this didn't help (I was on a 19.12.x). Started troubleshooting and noticed that if I uninstall Adrenalin and default back to MS Basic Display Adapter I can get 4k without a problem. Also, my boot screen is in high 4k resolution. It drops to 900p once I get to W10.
Other things I've tried:
- Tried installing the bare driver without Radeon Settings, no 4k
- Tried installing earlier Adrenalin versions (19.11.3 and 19.8.1), no 4k
- Tried uninstalling every driver with AMD Cleanup Utility and reinstalling Adrenalin, no 4k
- Tried uninstalling my LG ULTRA HD driver, no 4k
My GPU is a PowerColor 5700 (non-blower). Not really sure if this is a driver issue or a GPU issue.