I have R9 290, latest drivers (21.5.2) I recently bought IIYAMA G-Master GB3467WQSU which has native resolution of 3440x1440p. Windows recommends 3840x2160 which looks a little bit weird. If I force 3440x1440 I have black bars on top and bottom. After uninstalling AMD drivers, Windows recommended 1024x768, but I was able to force 3440x1440 and it looked alright. I thought that maybe some settings in Radeon Software are screwing things up, so I installed just the driver itself, but unfortunately I'm back to square one: weird looking 3840x2160 or 3440x1440 with black bars on top & bottom. Any ideas?