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

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Message-ID: <20120207002116.GA22553@ime.usp.br>
Date:	Mon, 6 Feb 2012 22:21:42 -0200
From:	Rogério Brito <rbrito@....usp.br>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
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

Hi there.

On Feb 06 2012, Bjorn Helgaas wrote:
> 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.

It's quite late here and I'm going to bed, but tomorrow I will send the
things that I collected so far (not much more, but still).


Thanks for the reminder,

-- 
Rogério Brito : rbrito@...e.usp.br,gmail.com} : GPG key 4096R/BCFCAAAA
http://rb.doesntexist.org : Packages for LaTeX : algorithms.berlios.de
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