linux-kernel - Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init

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Message-ID: <CAErSpo5R7uAoN01zS2eMKPHJq3RF6mXN1d1j8C143ZuKziYEVw@mail.gmail.com>
Date:	Mon, 6 Feb 2012 15:11:15 -0800
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Rogério Brito <rbrito@....usp.br>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Edward Donovan <edward.donovan@...ble.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Márcia Coutinho de Brito <mcbrito@...il.com>,
	Ram Pai <linuxram@...ibm.com>, rui.zhang@...el.com
Subject: Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init

On Thu, Jan 26, 2012 at 7:41 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Thu, Jan 26, 2012 at 4:16 AM, Rogério Brito <rbrito@....usp.br> wrote:
>> On Thu, Jan 26, 2012 at 00:03, Yinghai Lu <yinghai@...nel.org> wrote:
>>> 2012/1/25 Rogério Brito <rbrito@....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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