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When booting on external display with closed lid, no matter if the lid is open afterwards or if the external display is being unplugged - the primary laptop screen remains blank. NVidia Settings are showing that the display is present, but NVidia is unable to cope with it (NVidia control panel automatically deselects the display if I try to play with its options).
No BIOS option is present for disabling iGPU, while an option for dGPU/hybrid dGPU+iGPU mode is present as Automatic Setting on Predator Sense button.
The only workaround I found out, is to boot with open lid and close it afterwards...which is totally inconvenient, if you ask me.