SHEARING OF INTERRUPT REQUEST LINE (IRQ)

M

Mike

SHEARING OF INTERRUPT REQUEST LINE (IRQ)

My computer network card and the motherboard sound are shearing the same IRQ
11. Both the network card and the motherboard sound in the Device Manager
has the Use automatic settings under the Resource tab grayed out, so I am
unable to change the IRQ. IRQ 3 and 6 are available for use.

How do I set one of the devices to one of the available IRQ?

I notice that Microsoft ACPI-Compliant System is using IRQ9, is Microsoft
ACPI-Compliant System supposed to take-up an IRQ?

My computer IRQ settings.

IRQ 0 System timer
IRQ 1 Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
IRQ 4 Communications Port (COM1)
IRQ 5 VIA Rev 5 or later USB Universal Host Controller
IRQ 5 VIA Rev 5 or later USB Universal Host Controller
IRQ 8 System CMOS/real time clock
IRQ 9 Microsoft ACPI-Compliant System
IRQ 10 RADEON 7200 SERIES
IRQ 11 Linksys LNE100TX Fast Ethernet Adapter(LNE100TX v4) #2
IRQ 11 Creative AudioPCI (ES1371,ES1373) (WDM)
IRQ 12 PS/2 Compatible Mouse
IRQ 13 Numeric data processor
IRQ 14 Primary IDE Channel
IRQ 15 Secondary IDE Channel
 
R

R. McCarty

They are sharing because both are PCI add-in cards and every
motherboard has a "Hard Wired" IRQ mapping table. You have
to check the motherboard documentation which will show you a
table of how the PCI slots are configured with on-board devices.

Usually, Slots #2 & #5 are the only ones that have an independent
IRQ assignment ( Not Shared ).

Also on newer motherboards there is a APIC ( Advanced
Programmable Interrupt Controller ). This extends the IRQ range
from a maximum of 15 to 23 IRQ lines.

It's normal for peripherals to share IRQs, but some hardware works
better on shared IRQs than others.

You should check your BIOS configuration and see if there is an
enable/disable function for APIC.
 
B

Bob I

Yes, this is a normal PCI configuration. Move the card to a different
slot if you are having problems due to poor drivers.
 

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