[HELP] Can't see image on 34" ultrawide monitor on HD630

I have a brand new 34" IIyama XUB3493WQSU ultrawide monitor. Hackintosh is 10.15.3 Catalina i7 9700, ASUS PRIME Z390, no dedicated graphics. It sees both monitors (new + old 23" 1080p LG one) but no image on new IIyama. No matter what port I use to connect 34" monitor (DP or HDMI), it doesn't work. Can anybody [HELP] with that?

submitted by /u/alexnov
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