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

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Message-Id: <201210260820.03379.linux@rainbow-software.org>
Date:	Fri, 26 Oct 2012 08:20:03 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Robert Hancock <hancockrwd@...il.com>,
	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] Enable A20 using KBC for some MSI laptops to fix S3 resume

On Friday 26 October 2012, H. Peter Anvin wrote:
> My guess is that Windows explicitly enables A20 on resume.  We should do
> that too, really... with the current heavily unified realmode code it
> should be easy - let me hack up a patch in the morning.

Neither s3_beep nor s3_leds (this patch: 
https://lists.ubuntu.com/archives/kernel-team/2011-May/015621.html ) worked 
for me so I thing that BIOS breaks on resume before we can do anything.

> Robert Hancock <hancockrwd@...il.com> wrote:
> >On 10/24/2012 02:09 PM, Alan Cox wrote:
> >> On Wed, 24 Oct 2012 12:36:04 -0700
> >>
> >> "H. Peter Anvin" <hpa@...or.com> wrote:
> >>> Minor concern: it should do the wait for ready before sending each
> >
> >command.
> >
> >> Can we get a command line to do this quirk too - it strikes me that
> >
> >if
> >
> >> the MSIs rely upon it then it may be something Windows always does so
> >> will be useful to try on other problem machines as an experiment.
> >
> >I agree, one has to keep in mind the age-old question "how does Windows
> >
> >work?" since it surely has no such quirk. I'd say we're sometimes too
> >quick to add these DMI quirks when a more general solution would be
> >somehow figure out how the Linux behavior differs from what Windows is
> >doing.



-- 
Ondrej Zary
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