From: "H. Peter Anvin" <hpa@zytor.com>
To: Ondrej Zary <linux@rainbow-software.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] Enable A20 using KBC for some MSI laptops to fix S3 resume
Date: Tue, 11 Dec 2012 12:56:20 -0800 [thread overview]
Message-ID: <50C79DF4.3020300@zytor.com> (raw)
In-Reply-To: <201212112150.38410.linux@rainbow-software.org>
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.
prev parent reply other threads:[~2012-12-11 20:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 8:56 [PATCH v3] Enable A20 using KBC for some MSI laptops to fix S3 resume Ondrej Zary
2012-11-05 20:35 ` Ondrej Zary
2012-12-10 21:26 ` H. Peter Anvin
2012-12-10 22:51 ` Ondrej Zary
2012-12-11 18:59 ` Ondrej Zary
2012-12-11 19:07 ` H. Peter Anvin
2012-12-11 20:29 ` Ondrej Zary
2012-12-11 20:36 ` H. Peter Anvin
2012-12-11 20:50 ` Ondrej Zary
2012-12-11 20:56 ` H. Peter Anvin [this message]
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