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James Mckenzie wrote:
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<pre wrap="">-----Original Message-----
From: David Cary Hart <a class="moz-txt-link-rfc2396E" href="mailto:Fedora@TQMcube.com"><Fedora@TQMcube.com></a>
Sent: Jan 30, 2005 9:45 PM
To: For users of Fedora Core releases <a class="moz-txt-link-rfc2396E" href="mailto:fedora-list@redhat.com"><fedora-list@redhat.com></a>
Subject: Re: FC3 Irq Conflicts on Laptop
On Sun, 2005-01-30 at 21:35 -0700, James McKenzie wrote:
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<pre wrap="">You might have to enable the second PCI IRQ in your systems BIOS before
trying to divert it through software. I'm wondering why you are getting
the error, as IRQ 11 should be your PCI bus interrupt and you should not
have an 8250 UART in your system. I have as much as you do in my
system, and I do not get this error. However, PCI IRQ movement is more
art than science.
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<pre wrap="">What happens if he recompiles with APIC and APIC IO (assuming his
machine supports this)? Are their other non-standard kernel options that
<might help?
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David:
I don't know if this would help. What I was commenting on is assignment of certain devices to a particular IRQ. That could help, then again it may not solve the problem of an overloaded IRQ. PCI is an extension of the old Extended ISA bus, which allowed level based IRQ handling which was supposed to prevent IRQ 'collisions'. I'm guessing that is what is happening in this case. Moving the device to another IRQ should eliminate collisions but may not eliminate the overflow problem that the device experiences.
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It would also be nice to know the answer to a more generic question:<br>
how can an IRQ of a (any) device be changed, w/o changing the driver? I
suppose most drivers are responsible for making the best pick, but it
looks like sometimes they don't. Perhaps some of them are configurable?
Or is there anything else like the pcmcia.opts mentioned to
suggest/tell the best IRQ for a device?<br>
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