I installed FreeBSD 9.0 i386 but you, ACPI = off (amd64, do not work on my laptop), works very well i386, but I have a boot problem, "Root mount waiting for: usbus2".
This is the output from dmesg:
$ dmesg
Copyright (c) 1992-2012 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988...