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Date: Tue, 31 Aug 2010 09:29:33 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: kuba guzik <kuba.g4@gmail.com>
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Cc: freebsd-acpi@freebsd.org, Ian Smith <smithi@nimnet.asn.au>
Subject: Re: acpi shows wrong battery state
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on 31/08/2010 04:40 kuba guzik said the following:
>>  It would be good too see full verbose dmesg and acpidump -dt output.
>>  (Preferably uploaded somewhere)
> 
> My configs from 8.0 and 8.1
> http://kubag.pl/BSD
>

So this is your actual error:
acpi_ec0: <Embedded Controller: GPE 0x17> port 0x62,0x66 on acpi0
acpi_ec0: EcRead: failed waiting to get data
ACPI Exception: AE_NO_HARDWARE_RESPONSE, Returned by Handler for
[EmbeddedControl] 20090521 evregion-531
ACPI Error (psparse-0633): Method parse/execution failed
[\\_SB_.PCI0.LPC_.EC0_.OSTE] (Node 0xffffff0001699160), AE_NO_HARDWARE_RESPONSE
ACPI Error (psparse-0633): Method parse/execution failed
[\\_SB_.PCI0.LPC_.EC0_._REG] (Node 0xffffff0001699180), AE_NO_HARDWARE_RESPONSE
acpi_ec0: can't install address space handler for \\_SB_.PCI0.LPC_.EC0_ -
AE_NO_HARDWARE_RESPONSE
device_attach: acpi_ec0 attach returned 6

Because of it (failed initialization of EC) you get all the subsequent errors.
So this is indeed seems to be a hardware issue or an issue with communicating to
hardware, as Ian has originally suggested.
So, try to follow Ian's recommendations and play with various settings for EC.

-- 
Andriy Gapon