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

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Message-ID: <4772016D.30900@qumranet.com>
Date:	Wed, 26 Dec 2007 09:23:25 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Robert Hancock <hancockr@...w.ca>,
	Carlos Corbacho <carlos@...angeworlds.co.uk>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	"H. Peter Anvin" <hpa@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: x86: Increase PCIBIOS_MIN_IO to 0x1500 to fix nForce 4 suspend-to-RAM

Linus Torvalds wrote:
>
>> IMO, we should check which version of the specification we're supposed to
>> follow, on the basis of FADT contents, for example, and follow this one.
>>     
>
> No, we should try to figure out what Windows does. *If* windows checks the 
> version, we should do that too. But we should absolutely *not* just assume 
> that the documentation is an accurate picture of reality.
>
> Does anybody know how we could find out? 
>
>   

Run it in a virtual machine, with the ACPI methods of interest wired to
output to some port, and log that I/O port in the monitor/emulator.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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