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IRQ Conflict?
http://forum.linhes.org/viewtopic.php?f=2&t=13839		 Page 1 of 1
Author:  kmkittre [ Thu Jan 25, 2007 7:41 pm ]
Post subject:  IRQ Conflict?
I'm trying to sort out a problem with my frontend crashing, and based on another thread I have going I think it may be due to an IRQ conflict. I thought the question concerning hardware conflicts would best be served in the "Hardware" forum, so I'm hoping to get more help over here now that I have a better feel for the potential cause of my problem.

When I do an lspci -v and look for assigned IRQs I can sort out the following assignments:

Code:
VGA compatible controller: nVidia Corporation C51G [GeForce 6100] (on motherboard video) = IRQ 10
SMBus: nVidia Corporation MCP51 SMBus = IRQ 10
Bridge: nVidia Corporation MCP51 Ethernet Controller = IRQ 10

USB Controller: nVidia Corporation MCP51 USB Controller = IRQ 11
IDE interface: nVidia Corporation MCP51 Serial ATA Controller = IRQ 11
Multimedia audio controller: nVidia Corporation MCP51 AC97 Audio Controller = IRQ 11

USB Controller: nVidia Corporation MCP51 USB Controller = IRQ 5
VGA compatible controller: nVidia Corporation GeForce 7300 GS (Video Card I'm Using) = IRQ 5


It looks like I have multiple pieces of hardware using the same IRQ. Is this just me misunderstanding the information, or it this truly a problem? Does anyone know how I can fix this if it is the source of my frustration?
Thanks!
Author:  kmkittre [ Fri Jan 26, 2007 2:34 pm ]
Post subject: 
More info:
I was looking into IRQ conflicts online and I learned a better way to list your IRQs (cat /proc/interrupts)

When I do this, I get:

Code:
           CPU0
  0:   16631787          XT-PIC  timer
  1:         10          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  4:       6027          XT-PIC  lirc_serial
  5:    1029320          XT-PIC  ehci_hcd:usb2, nvidia
  7:         13          XT-PIC  parport0
  9:          0          XT-PIC  acpi
 10:   12690234          XT-PIC  eth0
 11:     155703          XT-PIC  libata, ohci_hcd:usb1, Intel ICH
 12:        113          XT-PIC  i8042
 14:      15151          XT-PIC  ide0
 15:         37          XT-PIC  ide1
NMI:          0
LOC:   16631558
ERR:          0
MIS:          0


From what I've seen around it looks like this isn't an IRQ conflict I'm dealing with... If it was an IRQ conflict I would see two lines with the same IRQ number.

I wish I could just figure this out :(
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