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And the HDMI output in question is that of an HDMI port on the laptop, not of an HDMI adapter connected to a USB-c, right? 9th gen. Coffee Lake i7-9850H is fitted with UHD630 iGPU carrying id 0x3E9B; that's natively supported in all recent macOS versions. As stated in the Whatevergreen User Manual, you should be using CFL framebuffer 0x3EA50009. ID: 3EA50009, STOLEN: 57 MB, FBMEM: 0 bytes, VRAM: 1536 MB, Flags: 0x00830B0A TOTAL STOLEN: 58 MB, TOTAL CURSOR: 1 MB (1572864 bytes), MAX STOLEN: 172 MB, MAX OVERALL: 173 MB (181940224 bytes) Model name: Intel HD Graphics CFL CRB Camellia: CamelliaV3 (3), Freq: 0 Hz, FreqMax: 0 Hz Mobile: 1, PipeCount: 3, PortCount: 3, FBMemoryCount: 3 [0] busId: 0x00, pipe: 8, type: 0x00000002, flags: 0x00000098 - ConnectorLVDS [1] busId: 0x05, pipe: 9, type: 0x00000400, flags: 0x000001C7 - ConnectorDP [2] busId: 0x04, pipe: 10, type: 0x00000400, flags: 0x000001C7 - ConnectorDP 00000800 02000000 98000000 01050900 00040000 C7010000 02040A00 00040000 C7010000 Having set DVMT to 64MB in BIOS, you no longer need to patch FBmem ans StolenMem any more, indeed. HDMI output usually registers against connector con1. I would have kept the index unmodified... And you only need to patch the connector type (to 00080000) to gain HDMI audio. The video output should still work with default DP type. Try with the default framebuffer settings (i.e no connector patching) and experiment with other SMBIOS like MBP15,x/MBP16,x for instance.