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No output on laptop internal display - Catalina installer

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I'm attempting to install Catalina on a Toshiba Portege R930-117. I've been following this guide for my opencore setup. The laptop has an Intel i7-3520M (Ivy Bridge) CPU with built-in intel HD graphics 4000 and a 1366x768 display. I have managed to get the system to boot, with the verbose boot info showing on the laptop display until it goes black, at which point, if a HDMI display is connected, it will show the installer on there, but never on the laptop's display. I have tried changing the AAPL,ig-platform-id in PciRoot(0x0)/Pci(0x2,0x0) in device properties and through boot-args in the config.plist to: 0x01660001 (01006601),  0x01660002 (02006601), 0x01660008 (08006601), 0x01660009 (09006601), 0x01660003 (03006601), 0x01660004 (04006601). Any help with what I should try next would be greatly appreciated.

IOReg shows no built-in display at all attached to FB@0. So, it's as if your built-in LCD did not exist.

In your SSDT-PNLF, try and rename GFX0 by IGPU. Not sure it'll fix the issue but I think the table is incorrect given that IOREg shows device "IGPU" @2.

Failing that, try and inject your screen's EDID maybe.


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