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Date: Wed, 12 Dec 2007 21:29:22 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Rene Herman <rene.herman@gmail.com>, "David P. Reed" <dpreed@reed.com>,
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       Krzysztof Halasa <khc@pm.waw.pl>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
       rol@witbe.net
Subject: Re: More info on port 80 symptoms on MCP51 machine.
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> One wonders if it does some SMM trick to capture port 0x80 writes and 
> attempt to haul them off for debugging; it almost sounds like some kind 
> of debugging code got let out into the field.

Not implausible. We've got a bug I've been dealing with where a vendor
left debug stuff enabled via the parallel port and which clearly
"escaped" from the test environment to the BIOS proper.