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Date:	Sat, 15 Dec 2007 08:22:16 +0100
From:	Rene Herman <>
To:	"H. Peter Anvin" <>
CC:	Chuck Ebbert <>,
	Rene Herman <>,
	Alan Cox <>,
	"David P. Reed" <>, Pavel Machek <>,
	Andi Kleen <>,
	"linux-os (Dick Johnson)" <>,
	David Newall <>,
	Paul Rolland <>,
	Krzysztof Halasa <>,,
	Thomas Gleixner <>,
	Ingo Molnar <>,
Subject: Re: More info on port 80 symptoms on MCP51 machine.

On 14-12-07 23:05, Chuck Ebbert wrote:

> On 12/12/2007 04:05 PM, H. Peter Anvin wrote:

>> Rene Herman wrote:

>>> By the way, _does_ anyone have a contact at nVidia who could clarify?
>>> Alan maybe? I'm quite curious what they did...
>>> Summary:
>>> Unless after booting with "acpi=off", outputs to port 0x80 (the legacy
>>> way to delay I/O) reliably, but not immediately, hang MCP51 machines.
>>> Outputs to port 0xed do not indicating it's a not a generic bus abort
>>> problem.
>> Sorry, the first sentence didn't parse unambiguously for me.  Do you
>> mean "acpi=off" works, or that "acpi=off" allows *subsequent* boots to
>> work?
>> I have some people at nVidia I can probably ping.

Sorry, didn't see this again due to aforementioned horseshit ISP. "acpi=off" 
works it seems. Report from David Reed here:

> Have them search on Google for:
>   hp tx1000 noapic
> :)


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