Cannot change screen resolution in High Sierra - KVM

Hi guys,

I am new to the world of hackintosh. I've successfully installed High Sierra in KVM. Everything is working, but I am unable to change resolution. I've installed ScreenResX and I got only one resolution option (1024x768). When I tried adding custom res (1920x1080 x 60hz) and rebooted, it failed (Status: Not activated - invalid?).

Then I tried changing res in config.plist.stripped.qemu to 1920x1080. Successfully saved, but it made no difference.

Getting little desperate over here. Any suggestions? Am I doing something wrong?

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Thank you guys!