IRQ Conflict

[Curtis George]

Thanks for the info, I have discovered some interesting things recently.  I went ahead and reverted to Fedora 9 since I knew that one worked for me and found that the IRQ is being shared by the same 3 devices.  I then updated the kernel on Fedora 9 to 2.6.27 (which is also what Fedora 10 starts out with) and got the same IRQ disabled messages and sure enough my computer locked up within a few minutes of booting that kernel.  Luckily I still had the 2.6.25 kernel installed, so I booted into that one instead.  

Does this mean there is a possible problem with the 2.6.27 kernel?  What is the actual cause of this problem?

If you do a google search on Linux IRQ Disabled you will find that this problem has existed in various forms without identifying the actual cause.  I should mention that I cannot move around my devices (they are either builtin or using the only compatible slot).  I also do not have a disable PnP OS option in BIOS.  I also saw a suggestion to change the SATA mode to AHCI in BIOS instead of IDE, but I don't have that option either (for me only RAID or non-RAID).  This worked from some, but I think in their case the ata device was involved in the interrupt that was being disabled.

- Curtis George

> Date: Sun, 4 Jan 2009 21:03:14 +0900
> From: debian at herakles.homelinux.org
> To: fedora-test-list at redhat.com
> Subject: Re: IRQ Conflict
> 
> Mick M. wrote:
> >
> 
> >>
> >> 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.
> 
> PCI interrupts are supposed to be sharable. There are four interrupts, 
> INT#A through INT#D which can be mapped to ISA interrupts any way the 
> BIOS or OS likes.
> 
> If the PCI interrupts on your system are not sharable, then the system's 
> broken.
> 
> If your BIOS has asks about a PnP OS, change it and try that. Generally, 
> I say I have one, have said so since 2.4 kernels.
> 
> If that does not work, say "no" and try assigning some IRQs in the BIOS.
> 
> 
> Shuffling cards might help, but most of my systems' PCI slots are empty.
> 
> 
> 
> 
> 
> -- 
> 
> Cheers
> John
> 
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