[issue676] SB600 HDA audio (Realtek ALC883) glitch - IRQ sharing?

[Joe "Floid" Kanowitz]

Joe "Floid" Kanowitz <jkanowitz at snet.net> added the comment:

Tried the suggested:
>    sysctl kern.emergency_intr_enable=1
>    sysctl kern.emergency_intr_freq=20

. ..both at runtime and as loader.conf variables (quoted appropriately, confirmed
set), didn't notice any impact.  While live, I tried 'freq's from 1 to 500.  But
see below...

>    The real issue here is that our interrupt routing is horribly out of
>    date, and it isn't an easy thing to port from the current best
>    implementation available, which is in FreeBSD.

This got me to open my eyes and notice that the BIOS configuration (as flashes
on the screen during the boot process) says there's a 'Multimedia Device' on IRQ
15.  I should probably take a snapshot or something, as I can't remember if it
was assigning *anything* to 3.

The only thing dmesg has to say about IRQ 15 is:
  APIC_IO: MP table broken: IRQ 15 not ISA when IRQ 14 is!

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