From owner-freebsd-acpi@FreeBSD.ORG  Wed May  5 00:36:42 2010
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From: Rui Paulo <rpaulo@FreeBSD.org>
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To: Kostik Belousov <kostikbel@gmail.com>
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Cc: Giovanni Trematerra <giovanni.trematerra@gmail.com>,
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Subject: Re: Kernel panic when unpluggin AC adaptor
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On 4 May 2010, at 21:38, Kostik Belousov wrote:

> On Tue, May 04, 2010 at 10:27:23PM +0200, David DEMELIER wrote:
>> 2010/5/4 Kostik Belousov <kostikbel@gmail.com>:
>>> On Tue, May 04, 2010 at 06:35:52PM +0200, David DEMELIER wrote:
>>>> Good news ! It worked, check the picture here :
>>>>=20
>>>> http://img63.imageshack.us/img63/4244/dsc00361g.jpg
>>>=20
>>> Please try adding code fragment like this:
>>>        if (cx_next->p_lvlx =3D=3D NULL)
>>>                printf("Going to panic.\n");
>>> to  dev/acpi/acpi_cpu.c:acpi_cpu_idle() function, right before
>>>    CPU_GET_REG(cx_next->p_lvlx, 1);
>>> line and see if it prints the message immediately before the panic.
>>>=20
>>=20
>> Yes it does at the beginning of the kernel panic.
>=20
> Ok, so the point of panic is found, it is NULL cx_next->p_lvlx =
resource.
> With the data in hand, I recommend you to ask on acpi@ (added a Cc:)
> about the cause and possible solution.

I don't remember the details, but I've seen this before. Does your CPU =
Cx levels change when you plug/unplug the AC adapter?

Regards,
--
Rui Paulo