[linux-audio-user] Setting IRQ on intel8x0-card

Paul Davis paul at linuxaudiosystems.com
Tue Oct 10 10:17:54 EDT 2006


On Tue, 2006-10-10 at 08:32 +0200, Clemens Ladisch wrote:
> Paul Davis wrote:
> > On Mon, 2006-10-09 at 15:07 -0400, Lee Revell wrote:
> > > Has it ever been possible to change the IRQs of onboard devices?  I
> > > thought it was hard wired.
> > 
> > the wiring into the IO-APIC is board-level, but the IO-APIC is
> > programmable and thus you can change the actual IRQ that the device
> > generates, in theory.
> 
> But at this point, the interrupt lines from onboard and external PCI
> devices are already merged, so changing the IRQ would just move
> both devices.
> 
> When an onboard device and a PCI card conflict, you have to move the
> card to another slot (or, better, to fix the driver(s)).

just as a followup, ryan on #ardour pointed out the kernel boot argument
"acpi_irq_balance" which results in *much* better distribution of IRQs
among devices on my laptop. i still have the builtin soundcrap, plus the
yenta and HDSP driver on the same IRQ, but i used to have the ethernet
and two other devices there as well. others who tried it reported
improvements as well.

--p





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