B365M + 2 monitors only works if unplug+plug monitors + iGPU

Hi,

I have a Sonoma working 99% Gigabyte B365M-DS3 with 2 external monitors (DVI + HDMI) with iGPU but I can only make it work if:

1) I start Hackintosh with DVI cable totally unplugged (it doesn't work if cable is plugged and screen is Turned off).
2) I see login screen with horizontal black stripes in HDMI monitor.
3) I plug the DVI monitor and everything starts blinking with black screens.
4) it finally works, full gfx acceleration with 2 monitors DVI + HDMI.

But it's impossible to...

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