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From: Bjorn Helgaas <bhelgaas@google.com>
Date: Mon, 6 Feb 2012 15:11:15 -0800
Message-ID: <CAErSpo5R7uAoN01zS2eMKPHJq3RF6mXN1d1j8C143ZuKziYEVw@mail.gmail.com>
Subject: Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init
To: =?ISO-8859-1?Q?Rog=E9rio_Brito?= <rbrito@ime.usp.br>
Cc: Yinghai Lu <yinghai@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jesse Barnes <jbarnes@virtuousgeek.org>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Edward Donovan <edward.donovan@numble.net>,
        Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
        =?ISO-8859-1?Q?M=E1rcia_Coutinho_de_Brito?= <mcbrito@gmail.com>,
        Ram Pai <linuxram@us.ibm.com>, rui.zhang@intel.com
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On Thu, Jan 26, 2012 at 7:41 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> On Thu, Jan 26, 2012 at 4:16 AM, Rog?rio Brito <rbrito@ime.usp.br> wrote:
>> On Thu, Jan 26, 2012 at 00:03, Yinghai Lu <yinghai@kernel.org> wrote:
>>> 2012/1/25 Rog?rio Brito <rbrito@ime.usp.br>:
>>>>
>>>> Wild thoughts: I just saw that nouveau calls some ACPI stuff to get
>>>> EDID information and, as ACPI is broken on this notebook, could that
>>>> be a potential reason for the panic that I'm seeing? (Yes, I can take
>>>> a photo of the screen).
>>>
>>> Which 2.6.x kernel works on your laptop without disabling acpi?
>>
>> Unfortunately, no 2.6 kernel has worked on this laptop without
>> acpi=off. I also once booted FreeBSD here just to see how it would
>> behave and it also hang with ACPI enabled.
>>
>> From what I see on this notebook, if ACPI is not turned off, the
>> computer simply hangs once the ACPI is started (it gives one layman
>> like me the impression of entering an infinite loop). But, again, this
>> is just a layman observation of what the system appears to be doing.
>
> My guess is that most of these problems are related, so if we fixed
> whatever causes the ACPI hang, the other problems would probably go
> away, too.
>
> Did you figure out anything about the MTRRs?

Ping :)  Let me know if you'd like a patch to print out the MTRR info
later in boot where it will be slow enough to capture in a video.

 Bjorn
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