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

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Date:	Wed, 24 Oct 2012 21:56:42 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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

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"),
> >> +		     },
> >> +	 },
> >>  	{}
> >>  };


-- 
Ondrej Zary
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