Yoga 720 OS freezes when plugging in HDMI into USB-C adapter and flickering display

I have successfully installed macOS onto my Yoga 720 and got most of it working. The notebook doesn't have a HDMI connector so I am using a USB-C adapter. This adapter works fine with all connections (USB, Ethernet), but when I plug in an HDMI cable, the OS freezes. Do I have to apply the follow the Intel IGPU HDMI/DP audio guide? I'm not sure since it's HDMI via an USB-C adapter. I got working sound with AppleALC.kext.

I followed the Laptop backlight control using AppleBacklightFixup.kext guide and got working backlight and even the buttons on the keyboard are working. Unfortunately, on dark content the screen is flickering noticeably. I think I have to set a custom PWMMax value, but where do I find the correct value to insert?

Lenovo Yoga 720 - 13" - 81C3

i5-8250u, UHD 620, FHD w/ working touchscreen

submitted by /u/Flamingi123
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