Troubleshooting 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. Table
Table
IRQ Line | Assignment |
|
|
IRQ0 | System timer |
IRQ1 | Keyboard controller |
IRQ2 | Interrupt controller 1 to enable IRQ8 through IRQ15 |
IRQ3 | Available |
IRQ4 | Serial port (COM1 and COM3) |
IRQ5 | Parallel port |
IRQ6 | Diskette drive controller |
IRQ7 | Reserved |
IRQ8 | |
IRQ9 | ACPI functions (used for power management) |
IRQ10 | Available |
IRQ11 | Available |
IRQ12 | Mouse |
IRQ13 | Math coprocessor |
IRQ14 | IDE CD drive controller (available if disabled in System Setup program) |
IRQ15 | Reserved (available if IDE CD controller is disabled in System Setup program) |
|
|
Troubleshooting External Connections
Loose or improperly connected cables are the most likely source of problems for the system, monitor, and other peripherals (such as a printer, keyboard, mouse, or other external device). Ensure that all external cables are securely attached to the external connectors on your system. See Figure
Troubleshooting the Video Subsystem
Problem
•Monitor is not working properly.
•Video memory is faulty.
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Troubleshooting Your System