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Automatic Resource Allocation
There are several settings in the PCI / PnP Configuration section of the BIOS program that deal with assigning interrupt resources. This includes both regular IRQs and the internal PCI interrupt resources. For most applications there is no need to manually select or deal with these resources; in this case the default setting of "Auto" should be selected, to enable automatic resource allocation. Not all BIOSes have this setting.
When you use the "Auto" setting the BIOS will normally "lock" the "PCI IRQ and DMA Settings" (below) to reflect the fact that they are being set automatically by the BIOS. To unlock the individual settings so you can change them, you must turn off the "Auto" setting.