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Try EDID override https://www.tonymacx86.com/threads/solved-black-screen-after-upgrade-to-high-sierra.237050/page-5 post #45

What's wrong with them?

I patched SSDT's and DSDT, but it didn't fix it.

I fixed that with EDID override. However I still have problems with sleep. When it goes to sleep it wakes instantly and with black screen. And regarding the BIOS I couldn't find a separate option for CSM.

My bios doesn't allow to boot UEFI in legacy mode and fast boot is disabled.

I noticed that when changing the screen resolution with RDM to something else and reverting it back to 1080p it works fine. Is there a way to force macOS to boot with 1600x900 resolution? I already tried changing it in config.plist, but didn't work.

I already implemented backlight control and my bios only offers UEFI or Legacy and in legacy it doesn't recognize efi partition. Changing the resolution in config.plist didn't work either.

My bios doesn't let me boot in UEFI with legacy enabled.

Screen looks garbled when injecting intel graphics. When I disable inject in config.plist it shows only 7mb of VRAM with frequent glitches. DVMT-prealloc is set to 64mb. When I connect an external display and change the resolution to 1600x900 it works fine, even when I disconnect the external...