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

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Message-ID: <e3c7bcc1-5562-4fb9-ab34-a8f1b391c34d@email.android.com>
Date:	Thu, 25 Oct 2012 21:44:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Robert Hancock <hancockrwd@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Ondrej Zary <linux@...nbow-software.org>,
	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

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.

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.

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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