linux-kernel - Re: [RFT] x86 acpi: normalize segment descriptor register on resume

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Message-ID: <486A5977.8020905@firstfloor.org>
Date:	Tue, 01 Jul 2008 18:21:11 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	kernel-testers@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume

H. Peter Anvin wrote:
> Andi Kleen wrote:
>>> It still seems incredibly risky to push this for 2.6.26, especially
>>> given the Elan revelation.
>>
>> Do Elans even support S3?
> 
> I don't know if they do, but I don't know offhand the extent of machines
> that may have that problem, especially since Intel now document it as
> "failures are readily seen".

What document is that exactly?


> 
>>>  I think it needs to be tested on the 2.6.27
>>> track, and then possibly be pushed back via the 2.6.26-stable route.
>>
>> I'm just not sure how many suspend/resume cycles people really do
>> on a early (pre -rc) mainline kernel (or in linux-next for that
>> matter). You usually have to install on a laptop and actually
>> use it.
>>
>> Since this code is only executed on resume some directed testing
>> would be better. That is what Rafael asked for in this mail.
> 
> The issue is mostly if it breaks some obscure system.  I have put it on
> my laptop, Ingo has it on this test system with a suspend-testing cycle,
> and so on, but the number of systems exposed is going to be small.

Right now it looks like a significant number of Dell laptops
are affected by this regression. That's a serious issue.

-Andi
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