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 <li...@rainbow-software.org>
Acked-by: Rafael J. Wysocki <rafael.j.wyso...@intel.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-a...@vger.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"),
> + },
> + },
> {}
> };
>
>
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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