Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

How can I see/change the IRQ(L) of my device?

share|improve this question

1 Answer 1

up vote 4 down vote accepted

In the BIOS

This is probably the best place to check to change your IRQs.

On Windows

Open the device manager, right click a device and click Properties. Then go to the Resources tab.

This allows you to see/change the IRQ (Levels):

alt text

On Linux

Open up a shell and execute:

cat /proc/interrupts

This for example, gives:

           CPU0       CPU1       CPU2       CPU3
  0:        187          0          0          0   IO-APIC-edge      timer
  1:      39922          0          0          0   IO-APIC-edge      i8042
  7:          0          0          0          0   IO-APIC-edge      parport0
  8:          4          0          0          0   IO-APIC-edge      rtc
  9:          1          0          0          0   IO-APIC-fasteoi   acpi
 12:     846774          0          0          0   IO-APIC-edge      i8042
 14:     105048          0          0          0   IO-APIC-edge      libata
 15:          0          0          0          0   IO-APIC-edge      libata
 16:    1069722          0          0          0   IO-APIC-fasteoi   libata, uhci_hcd:usb4, nvidia
 17:     105382          0          0          0   IO-APIC-fasteoi   eth0
 18:      83040          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb2, libata
 19:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb1, ehci_hcd:usb5
 20:     474168          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb3, ohci1394, ra0
 21:      10117          0          0          0   IO-APIC-fasteoi   bttv0
 22:     594327          0          0          0   IO-APIC-fasteoi   HDA Intel
NMI:          0          0          0          0
LOC:    1754492    1545836    2085855    1878596
ERR:          0
MIS:          0
share|improve this answer
    
very nice! I'm impressed! - will upvote when I get more votes –  studiohack Jan 22 '11 at 21:52
    
-1. On windows that shows the IRQ associated with the device, not the IRQL that the OP asked for. I don't know enough about linux to be sure but I'm guessing it also shows the IRQ not IRQL. –  pipTheGeek Feb 1 '11 at 19:46
    
No, the IRQ is a number indicating which interupt line the device is connected to. The IRQL is a number maintained by the OS which controls which interupts are allowed to interupt which other interupts. There is more information here ext2fsd.sourceforge.net/documents/irql.htm –  pipTheGeek Feb 1 '11 at 21:11
    
Adjusted, see @pipTheGeek link for an in-depth explanation. :-) –  Tom Wijsman Feb 1 '11 at 21:21

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.