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Date: Mon, 4 Oct 2010 01:47:31 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Eitan Adler <lists@eitanadler.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: ACPI & battery issues
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In freebsd-questions Digest, Vol 330, Issue 10, Message: 5
On Sat, 2 Oct 2010 10:42:23 -0400 Eitan Adler <lists@eitanadler.com> wrote:

 > I see
 > ACPI Exception: AE_NO_HARDWARE_RESPONSE, Returned by Handler for
 > [EmbeddedControl] (20100331/evregion-588)
 > ACPI Error (psparse-0633): Method parse/execution failed
 > [\\_SB_.PCI0.LPCB.BAT1._BST] (Node 0xc6adba60),
 > AE_NO_HARDWARE_RESPONSE
 > 
 > repeatedly in dmesg
 > 
 > sysctl's relating to battery information is also slow:
 > % time sysctl hw.acpi.battery.state
 > hw.acpi.battery.state: 7
 > sysctl hw.acpi.battery.state  0.00s user 2.18s system 72% cpu 3.006 total
 > 
 > % time sysctl hw.acpi.battery
 > hw.acpi.battery.life: -1
 > hw.acpi.battery.time: -1
 > hw.acpi.battery.state: 7
 > hw.acpi.battery.units: 1
 > hw.acpi.battery.info_expire: 5
 > sysctl hw.acpi.battery  0.00s user 6.58s system 67% cpu 9.779 total
 > 
 > also note that the life and time are both negative one.
 >
 > This is on a Lenovo G530 laptop.

The Embedded Controller timed out so battery info is unknown / bogus, 
which appears quite likely the issue reported here:
http://www.freebsd.org/cgi/query-pr.cgi?pr=150517

If you're sure you have the latest Lenovo BIOS/EC updates, try posting 
your report above to the freebsd-acpi list, also providing OS version 
(uname -a) and contents of /var/run/dmesg.boot

Good luck, Ian