After install, at the boot> prompt, use "-c" to enter the kernel configurator after the kernel loads and before it begins probing hardware. Try disabling ACPI. This power and processor management standard is often not followed properly by manufacturers. At the user kernel configuration prompt, UKC>, type:
UKC> disable acpi
UKC> quit
The kernel will then probe hardware and ignore ACPI interfaces. This -might- work. The ramdisk kernel seemed to work for you, and the ramdisk kernel doesn't talk to the ACPI subsystem. If this works, you can make the change to your kernel permanent with config(8).
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