Hi,
With Coreboot and ACPI the interrupt gets routed to IRQ 0, even though
I put 18 in the _PRT table.  X loads more quickly, but there are
obvious problems with text highlighting.
        
This is OK, just the PCI line reg is not initialized. Its used only when the routing of PCI is done via 8259. Check http://www.coreboot.org/ACPI_in_coreboot#acpi_fill_madt

There is some pics which explains that.

In none of the three cases can I find the IRQ listed  in
/proc/interrupts.  I would have expected to see it there.

It means that the driver is not using any interrupts Maybe you need to load the "nvidia" proprietary module.

Rudolf


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