Irq Assignment Conflicts - Dell PowerEdge C8220X Hardware Owner's Manual

IRQ Assignment Conflicts

Most PCI devices can share an IRQ with another device, but they cannot use
an IRQ simultaneously. To avoid this type of conflict, see the documentation
for each PCI device for specific IRQ requirements.
IRQ Line Assignment
IRQ0 8254 timer
IRQ1 Keyboard controller
IRQ2 Cascade for IRQ9
IRQ3 Serial port (COM2) or
PCI IRQ pool definition
IRQ4 Serial port (COM1) or
PCI IRQ pool definition
IRQ5 PCI IRQ pool definition
IRQ6 PCI IRQ pool definition
IRQ7 Reserved
PCI IRQ pool definition is the BIOS code assigned at run time.
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Troubleshooting
IRQ Line Assignment
IRQ8 Real-time clock
IRQ9 PCI IRQ pool definition
IRQ10 PCI IRQ pool definition
IRQ11 PCI IRQ pool definition
IRQ12 Mouse controller
IRQ13 Processor
IRQ14 Primary IDE controller
IRQ15 Secondary IDE controller