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

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Date:	Mon, 10 Dec 2012 13:26:18 -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 11/05/2012 12:35 PM, Ondrej Zary wrote:
> On Friday 26 October 2012 10:56:44 Ondrej Zary wrote:
>> Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to enable
>> A20 line but resume code assumes that KBC was used.
>> The laptop will not resume from S3 otherwise but powers off after a while
>> and then powers on again stuck with a blank screen.
>>
>> Fix it by enabling A20 using KBC. Affected laptop list and DMI data are
>> from bug reports at Ubuntu Launchpad.
>>
>> Also add kernel parameter to easily activate this quirk on any system.
>>
>> Only compile tested. The original patch was tested with EX600 and PR200.
>>
>> Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878
> 
> The bug was marked as RESOLVED CODE_FIX but I wonder what happened to this 
> patch. Was it applied? Or is someone working on a better way to fix this 
> problem?
> 

Sorry, I managed to forget about this.

Is there any way you could test this patch by any chance?

I would be a lot happier if this works as a general solution rather than
relying on a quirk...

	-hpa


View attachment "0001-x86-suspend-Run-A20-test-on-resume.patch" of type "text/x-patch" (2156 bytes)