I have and Ultrawide monitor at 3440x1440 34" and a 2560x1440 27" and 1920x1080 27" monitor. Using basic window tools I can switch all to a 1080 vertical resolution and the results are flawless with perfect scaling. But with eyefinity I cannot scale down the resolution of both my monitors!!! It seems like such a simple solution/fix but I can't find it. It works like a charm with a 1440p and 1080p display but here instead eyfinity scaled both periphery monitors perfectly but instead of scaling down the 3440x1440 to 2560x1080 (fullscreen) it scaled it to 1920x1080 (centered) with black bars up down left and right. Please fix or add support to this
What kind of monitor is the 34" ultrawide? If it's the acer, I have found that acer did a poor job with defining resolutions. If you want that resolution with the acer x34, then you must create a custom resolution for it. You get to custom resolutions from Crimson Settings->Preferences->Radeon Additional Settings, then go to the custom resolutions tab.