https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270707
--- Comment #39 from John Baldwin <j...@freebsd.org> ---
Ok, looking at the dump, there are two separate things going on. First, the
global 'APIC' table (MADT) includes some overrides for certain IRQs:
Type=INT Override
BUS=0
IRQ=1
INTR=1
Flags={Polarity=active-lo, Trigger=edge}
Type=INT Override
BUS=0
IRQ=12
INTR=12
Flags={Polarity=active-lo, Trigger=edge}
Type=INT Override
BUS=0
IRQ=0
INTR=2
Flags={Polarity=conforming, Trigger=conforming}
Type=INT Override
BUS=0
IRQ=9
INTR=9
Flags={Polarity=active-lo, Trigger=level}
The general theme here seems to be active-lo interrupts for ISA (which is
typically bizarre).
Unfortunately your dump just has 'acpidump -t' output and not 'acpidump -d'
output that disassembles the compiled AML. The code in acpi_resource.c is
dealing with a separate bit of the ASL where individual Device() entries in the
namespace have an IRQ resource and the IRQ resource specifies the trigger mode
and polarity.
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