From owner-freebsd-acpi@FreeBSD.ORG  Tue Dec  3 14:44:41 2013
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Date: Wed, 4 Dec 2013 01:44:24 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: =?windows-1251?B?wOvl6vHl6SDI4uDt7uI=?= <a.ivanov@dep.ru>
Subject: Re: ACPI Error
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On Tue, 3 Dec 2013 11:27:47 +0400, ??????? ?????? wrote:
 > Здравствуйте, Freebsd-acpi.

Dec  3 10:57:40 fw kernel: AcpiOsExecute: failed to enqueue task, consider increasing the debug.acpi.max_tasks tunable
Dec  3 10:57:40 fw kernel: ACPI Error: Method parse/execution failed [\_GPE._L24] (Node 0xfffffe000763cd40), AE_NO_MEMORY (20110527/psparse-560)
Dec  3 10:57:40 fw kernel: ACPI Exception: AE_NO_MEMORY, while evaluating GPE method [_L24] (20110527/evgpe-606)
Dec  3 10:57:40 fw kernel: AcpiOsExecute: failed to enqueue task, consider increasing the debug.acpi.max_tasks tunable

So have you tried increasing the debug.acpi.max_tasks tunable in your
/boot/loader.conf?  See acpi(4) /LOADER TUNABLES.  What happens then?

cheers, Ian