Hi Peter, thanks for the info!

>Whether you can or not will depend on the capabilities of 00:00.0.
>Some have registers to block decoding for integrated devices.
>Sometimes they are documented. Sometimes not.

I've found a register to do what I want:
D0F0x7C IOC Configuration Control
bit 0 : ForceIntGfxDisable: internal graphics disable. Read-write. Setting this 
bit disables the internal graphics and the HD Audio Controller.

and it works :)
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