From owner-freebsd-stable  Fri Sep 20  3:42:52 2002
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To: freebsd-stable@freebsd.org, saper@system.pl
Subject: Re: pcm sound -> PCI IRQ problems on Sony VAIO?
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From: Pete French <pfrench@firstcallgroup.co.uk>
Date: Fri, 20 Sep 2002 11:42:49 +0100
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> 1) Is FreeBSD in UP mode really sharing IRQs? (can't boot MP kernel on
> this notebook)
>
> 2) Why when NO driver is attached to the irq 5 the system works
> properly?

Now this we have seen before - you will find references to this iin
the archives in various guises. people coomplaining about lockups
with an fxp controller, myself complaining about lockups with
a sym0 SCSI controller. But what they all had in common was
sharing iinterrupts - and the fix (at least in my case) was to remove
the driver sharing the interrupt.

Note that it was definietly a *driver* problem - I had an IRQ
shared with a device that was not generating any interrupts. But
the device driver (in my case ata) needed removing from the kernel
to fix the problem.

There seem to be some obscure (and rather rare I hope) problems with
sharing IRQ's  - the best advice is to configure the system so none
ofthem are shared if possible,and then remove and devices that you
dont need from the kernel.

-pcf.

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