linux-kernel - Re: [Bug 9528] x86: Increase PCIBIOS_MIN_IO to 0x1500 to fix nForce 4 suspend-to-RAM

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Message-ID: <20071223191937.GA28836@elte.hu>
Date:	Sun, 23 Dec 2007 20:19:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Carlos Corbacho <carlos@...angeworlds.co.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Greg KH <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>, bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug 9528] x86: Increase PCIBIOS_MIN_IO to 0x1500 to fix
	nForce 4 suspend-to-RAM

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > Why:
> > 
> > After debugging _PTS() in the DSDT, it turns out these nVidia boards are
> > trying to write to an IO port > 0x1000 (0x142E) during suspend. Before the
> > re-ordering, we got away with this.
> 
> Very interesting.
> 
> HOWEVER.
> 
> I'd much rather figure out what the magic IO resource is that clashes.

Carlos, could you please run the following script as root:

  http://redhat.com/~mingo/misc/probe-ports.sh

and send us the resulting probe-ports.txt file?

This script will probe all unused ports as per /proc/ioports and will 
list "suspect" IO port areas: ones that do not produce the expected 0xff 
default reply from unclaimed IO ports. Magic chipset register areas can 
potentially be mapped this way.

[ CAREFUL: This probes IO ports which might in theory trigger various
  nastiness such as lockups. I this on a few boxes and the script
  worked, but save any work in case you get lockups. ]

	Ingo
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