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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Nathan Whitehorn <nwhitehorn@freebsd.org>
Date: Wed, 21 Mar 2012 14:51:56 -0400
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Subject: Re: svn commit: r233250 - in head: share/man/man4 sys/amd64/acpica
	sys/contrib/dev/acpica sys/contrib/dev/acpica/common
	sys/contrib/dev/acpica/compiler
	sys/contrib/dev/acpica/components/debugger sys/co...
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On Wednesday 21 March 2012 10:31 am, Nathan Whitehorn wrote:
> On 03/20/12 14:37, Jung-uk Kim wrote:
> > Author: jkim
> > Date: Tue Mar 20 21:37:52 2012
> > New Revision: 233250
> > URL: http://svn.freebsd.org/changeset/base/233250
> >
> > Log:
> >    Merge ACPICA 20120320.
>
> After this, I get an endless series of "Large reference count -
> (increasingly large hex number) - utdelete-491" on the console when
> trying to boot my laptop. How should I go about trying to debug
> this?

You need to rebuild the kernel.  Add the following line to kernel 
configuration:

	options	ACPI_DEBUG

Then, type this from loader prompt:

	set debug.acpi.layer=ACPI_ALL_COMPONENTS
	set debug.acpi.level=ACPI_LV_ALLOCATIONS
	boot

You will be able to trace all refcount changes.  Once it boots, login 
and do this to turn it off:

	sysctl debug.acpi.layer=NONE

However, I am afraid it will spit out too much information for you to 
interpret the data. :-(

Jung-uk Kim