I think the approach here is a good compromise. Should fix recent platforms and not break older ones. Maybe commit message could say use of VGA cards on AGP and (parallel) PCI slots may have issues due to aliasing, and reference the error messages we add here.
Patch set 2:
Can we add this:
return (vga_pri && vga_pri->bus->no_vga16);
I might try to fix the 'aliasing avoidance' or just throw errors after resource assignments.
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