No Video Output after Sleep and crashing

[Cookiefamily]

Hello,
I just finished setting up everything for my new Hackintosh and it is working beautifully... except for one issue, when it "falls asleep" after 10 minutes (set in the system settings) or via the apple-logo->Sleep and I press a key or a mousebutton, it does wake up, the HDD activity LED is blinking and fans are running, but I don't get video output, my screen stays empty (no cable connected). When it falls asleep again and I wake it another time, 50% of the time it crashes and restarts.

A quick search in the Forum did not reveal any information to me (either I'm not good at searching or only few people have this issue).

System Specs:
AsRock z270 Extreme4
Intel i7 7700K
Integrated Graphics (630), no discrete GPU
macOS Sierra 10.12.6

Can someone help me?

 

[Cookiefamily]

EDIT: This should probably be moved since it is not only a graphics issue as I expected first. Can a Mod do that?

ok investigated a bit more, tried all darkwake modes, tried it with HibernationFixup.kext.
Letting the monitor "sleep" but not the computer works fine, it can resume afterwards.

darkwake 3 does not result in a kernel panic, but the display won't turn back on, all other darkwake options result in kernel panics (at least that is what I guess, when I turn on "Don't reboot on kernel Panic" they don't reboot themselves after waking up)