IRQ Conflict

[Mick M.]

--- On Sat, 1/3/09, Curtis George <rhlinux123 at hotmail.com> wrote:

> From: Curtis George <rhlinux123 at hotmail.com>
> Subject: IRQ Conflict
> To: fedora-test-list at redhat.com
> Date: Saturday, January 3, 2009, 5:04 PM
> I recently upgraded from Fedora 9 to Fedora 10, and I am
> having an IRQ conflict that I can't resolve.  It seems
> that my Ethernet NIC, RAID Controller, and onboard USB are
> all sharing the same IRQ.  I receive a bunch of
> "kernel:Disabling IRQ #16" messages (the IRQ that
> is being shared) and occasionally get locked up.  When I
> initially installed Fedora 9 I got this message as well, but
> found a tip that said to unplug all USB devices before
> installing, and this worked like a charm.  I tried to do the
> same thing with Fedora 10 but I still have the problem no
> matter what.  I did an extensive search (there are more
> questions then answers for this problem) and tried running
> with the acpi=off and irqpoll kernel options, but none of
> these help.
> 
> I'm guessing that when I installed Fedora 9 with all
> the USB unplugged that is chose differet IRQs so there was
> no confilict (I'm not sure though).  I can't
> manually set the IRQ on any of these devices, it seems to be
> up to the OS to choose.  Any ideas on what is causing this
> or how to fix it?
> 
> - Curtis George
> 

Hi;
  try moving cards around to different slots.
Some motherboards assign irq's to specific slots.
Then some cards only work with certain irq's.

On bootup you may see what irq goes where.
You may be able to play in the BIOS to help out.

Mick M