[Bug 211470] FreeBSD 11.0-BETA2 won't boot on an Acer Aspire 5560

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211470

            Bug ID: 211470
           Summary: FreeBSD 11.0-BETA2 won't boot on an Acer Aspire 5560
           Product: Base System
           Version: 11.0-BETA2
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: peterj at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I'm trying to boot the 11.0-BETA2/amd64fud):

ACPI APIC Table: <ACRSYS ACRPRDCT>
...
acpi0: <ACRSYS ACRPRDCT> on motherboard
ACPI Error: Hardware did not change modes (20160527/hwacpi-160)
ACPI Error: Could not transition to APCI mode (20160527/evxfevnt-105)
ACPI Warning: AcpiEnable failed (20160527/utxfinit-184)
acpi0: Could not enable ACPI: AE_NO_HARDWARE_RESPONSE  
device_attach: acpi0 attach returned 6

Followed by a NULL dereference panic at nexus_acpi_attach+0x89

The system boots a 10.0-RELEASE/amd64 memstick (the only other image I  
have conveniently to date) without problem.

The full set of kernel messages and the backtrace is available at
https://goo.gl/photos/nW5QhGvgmgkqEEpV6

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