freebsd stable - Jul 2016 - FreeBSD 11.0-BETA2 won't boot on an Acer Aspire 5560

I'm trying to boot the 11.0-BETA2/amd64 memory stick image and the
kernel panics: (Following copied by hand):

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.

-- 
Peter Jeremy
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On 27/07/2016 7:22 PM, Peter Jeremy wrote:
> I'm trying to boot the 11.0-BETA2/amd64 memory stick image and the
> kernel panics: (Following copied by hand):
> 
> 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.
> 
Thank you for the report Peter

Did it boot prior to 11.0-BETA2? ie; is it a regression?

Please report a bug in bugzilla with version: 11.0-BETA2 and cc
re at FreeBSD.org

If it's possible to obtain a backtrace of the panic, please include it
as an attachment:

https://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html

Setting debug.debugger_on_panic=1 in loader may help get it to the debugger.