kern/77805: Boot hangs with ACPI enabled

[Ron Johnson]

Any help would be appreciated! dmesg output and ASL are in the bug
report.

http://www.freebsd.org/cgi/query-pr.cgi?pr=77805

With ACPI enabled, boot fails at "hw.acpi.cpu.cx_lowest: C1 -> C3". This
statement is not in sysctl.conf or loader.conf and appears to be changed
automatically. No issue in all previous 5.X versions. 5.3-STABLE
downloaded from CVS on 2/19/2005 around 3pm EST.