Just saw this on a new Lenovo laptop. Saw miscellaneous hardware misbehavior, so was checking the BIOS settings.
As with many, there is a PCI IRQ area in the BIOS, with ten or fifteen settings, all of which can be Auto, Disable, or preset to 3, 4, 5, etcetera up to 11. The difference was this: from the factory, this laptop had all of the PCI IRQs set to the same, #11. When in the course of debugging I tried to do something more usual, anything except all-eleven, the laptop crashed on reboot.
I don’t know what this architecture is, but it is a radical departure from everything PCI I have ever seen before. And I will be trying all-eleven in the future, with 2007+ hardware!