linux-kernel - Re: [PATCH v3] Enable A20 using KBC for some MSI laptops to fix S3 resume

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Date:	Tue, 11 Dec 2012 12:56:20 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ondrej Zary <linux@...nbow-software.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Enable A20 using KBC for some MSI laptops to fix S3
 resume

On 12/11/2012 12:50 PM, Ondrej Zary wrote:
> On Tuesday 11 December 2012 21:36:46 H. Peter Anvin wrote:
>> On 12/11/2012 12:29 PM, Ondrej Zary wrote:
>>> Something like this? (It works.)
>>
>> Something like that.  We need to make sure we send the proper sequence,
>> though, or it might break some SMM firmware...
>
> Could you please create proper patch? You're the x86 expert (and I'm not).
>
> I've read that 0xd1 command with 0xdf data is often used to enable A20. But I
> don't know when this must be done or what else needs to be done for the SMM
> to not break.
>

You need to send an FF dummy command afterwards, that's all.


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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