Please test the following patch on -CURRENT: http://people.freebsd.org/~jkim/acpica-import-20071114.diff.gz I believe it should apply for RELENG_7 as well. FYI, ACPI-CA changes from the -CURRENT is here: http://people.freebsd.org/~jkim/acpica-changes-20070320-20071114.txt Thanks, Jung-uk Kim