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
