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

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Message-ID: <bb2a995e-86b7-4926-9ced-2adf5e28f597@email.android.com>
Date:	Wed, 24 Oct 2012 13:03:35 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ondrej Zary <linux@...nbow-software.org>
CC:	"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

Probably should.

Ondrej Zary <linux@...nbow-software.org> wrote:

>On Wednesday 24 October 2012 21:36:04 H. Peter Anvin wrote:
>> Minor concern: it should do the wait for ready before sending each
>command.
>
>It was a hack and then I forgot to add the waits... Should I redo the
>patch? 
>I'll not be able to test it as I have to return the machine.
>
>> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
>> >On Wednesday 24 of October 2012 08:47:52 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.
>> >>
>> >> Tested with EX600 and PR200.
>> >>
>> >> Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878
>> >>
>> >> Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
>> >
>> >Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> >
>> >> --- a/arch/x86/kernel/acpi/boot.c
>> >> +++ b/arch/x86/kernel/acpi/boot.c
>> >> @@ -1349,6 +1349,20 @@ static int __init
>> >
>> >dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
>> >
>> >>  }
>> >>
>> >>  /*
>> >> + * Enable A20 line using KBC even if it's already enabled using
>> >
>> >other method.
>> >
>> >> + * This is needed for some MSI laptops to resume from S3.
>> >> + */
>> >> +static int __init a20_enable_kbc(const struct dmi_system_id *d)
>> >> +{
>> >> +	printk(KERN_NOTICE "%s detected: enabling A20 using KBC\n",
>> >
>> >d->ident);
>> >
>> >> +	outb(0xd1, 0x64);	/* Command write */
>> >> +	outb(0xdf, 0x60);	/* A20 on */
>> >> +	outb(0xff, 0x64);	/* Null command, but UHCI wants it */
>> >> +
>> >> +	return 0;
>> >> +}
>> >> +
>> >> +/*
>> >>   * If your system is blacklisted here, but you find that
>acpi=force
>> >>   * works for you, please contact linux-acpi@...r.kernel.org
>> >>   */
>> >> @@ -1423,6 +1437,60 @@ static struct dmi_system_id __initdata
>> >
>> >acpi_dmi_table[] = {
>> >
>> >>  		     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
>> >>  		     },
>> >>  	 },
>> >> +	/*
>> >> +	 * 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.
>> >
>> >> +	 */
>> >> +	{
>> >> +	 .callback = a20_enable_kbc,
>> >> +	 .ident = "MSI EX600 Laptop",
>> >> +	 .matches = {
>> >> +		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
>> >> +		     DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook EX600"),
>> >> +		     },
>> >> +	 },
>> >> +	{
>> >> +	 .callback = a20_enable_kbc,
>> >> +	 .ident = "MSI EX700 Laptop",
>> >> +	 .matches = {
>> >> +		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
>> >> +		     DMI_MATCH(DMI_PRODUCT_NAME, "EX700"),
>> >> +		     },
>> >> +	 },
>> >> +	{
>> >> +	 .callback = a20_enable_kbc,
>> >> +	 .ident = "MSI GX700 Laptop",
>> >> +	 .matches = {
>> >> +		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
>> >> +		     DMI_MATCH(DMI_PRODUCT_NAME, "GX700"),
>> >> +		     },
>> >> +	 },
>> >> +	{
>> >> +	 .callback = a20_enable_kbc,
>> >> +	 .ident = "MSI VR201 Laptop",
>> >> +	 .matches = {
>> >> +		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
>> >> +		     DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR201"),
>> >> +		     },
>> >> +	 },
>> >> +	{
>> >> +	 .callback = a20_enable_kbc,
>> >> +	 .ident = "MSI VR601 Laptop",
>> >> +	 .matches = {
>> >> +		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
>> >> +		     DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR601"),
>> >> +		     },
>> >> +	 },
>> >> +	{
>> >> +	 .callback = a20_enable_kbc,
>> >> +	 .ident = "MSI PR200 Laptop",
>> >> +	 .matches = {
>> >> +		     DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
>> >> +		     DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook PR200"),
>> >> +		     },
>> >> +	 },
>> >>  	{}
>> >>  };

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