I remember reading for early ACPI machines, it's best to keep it disabled, but it couldn't hurt to test using acpi instead of apm+pcibios on this machine.
Also, trying a snapshot wouldn't hurt.. but these snapshots are NOT what's going to be the 4.8 release in November, this is the development code for what will be 4.9.
There have been some commits for
clcs(4) (..
sys/dev/pci/cs4280.c) but they appear to be mostly mechanical, might as well try it anyway.
As for the I/O and IRQ information you provided, that's mostly irrelevant for PCI devices.. that information is gathered automatically from either PCI routing tables or ACPI routing tables (..
pcibios(4)/
acpiprt(4)).