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I have an old P8Z76-V LX board that doesn't have the option to disable CSM completely. What it does have is an option to choose "PCI ROM Priority", Legacy or EFI Compatible. In my world EFI Compatible should mean that it uses an efi-rom when such is available. The thing is that I have tried to add GOP-drivers for integrated Intel-gpu, just ignores it. Also tried a graphicscard with hybrid vbios, same here, seems to ignore the UEFI-part. The only thing that seems to work is loading the satadriver efi-module that I added to the bios.

So I guess that all Z68 boards from ASUS uses this option instead of CSM disable/enable. Has anyone had success with booting a graphics card in UEFI with one of those boards?