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

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Message-ID: <50C78486.9070700@zytor.com>
Date:	Tue, 11 Dec 2012 11:07:50 -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 10:59 AM, Ondrej Zary wrote:
>
> As I said before, the BIOS probably breaks on resume before any Linux code is
> executed. So any fix must be done before suspending.
>

Well, that code should be independent of A20, being in low memory, but 
if the BIOS itself crashes, then that's... yeah.

> I hate quirks too. A general solution would be to always enable A20 using KBC
> (if KBC is present) but that's probably not acceptable.

I don't see why not.  If so we could just do it as part of the 
initialization of the i8042 driver.

	-hpa

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

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