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Date: Sun, 13 May 2012 23:06:15 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Bruce Cran <bruce@cran.org.uk>
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Cc: freebsd-acpi@FreeBSD.org, freebsd-current <freebsd-current@FreeBSD.org>,
	Jung-uk Kim <jkim@FreeBSD.org>
Subject: Re: ACPI 'driver bug: Unable to set devclass'
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on 13/05/2012 11:39 Bruce Cran said the following:
> I've just updated to -current and noticed the following errors in dmesg:
> 
> acpi0: <NEC > on motherboard
> acpi0: Power Button (fixed)
> acpi0: reservation of fee00000, 1000 (3) failed
> acpi0: reservation of 0, a0000 (3) failed
> acpi0: reservation of 100000, bbf00000 (3) failed
> driver bug: Unable to set devclass (class: acpi_sysresource devname: (unknown))
> driver bug: Unable to set devclass (class: acpi_timer devname: (unknown))
> cpu0: <ACPI CPU> on acpi0
> ACPI Warning: Incorrect checksum in table [OEMB] - 0x45, should be 0x44
> (20120420/tbutils-293)
> driver bug: Unable to set devclass (class: acpi_sysresource devname: (unknown))
> cpu2: <ACPI CPU> on acpi0
> driver bug: Unable to set devclass (class: acpi_sysresource devname: (unknown))
> cpu1: <ACPI CPU> on acpi0
> driver bug: Unable to set devclass (class: acpi_sysresource devname: (unknown))
> 

Can you produce an equivalent snippet with verbose logging enabled?
I have a suspicion that these messages are a byproduct from r231161.
-- 
Andriy Gapon