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> --- 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"), + }, + }, {} }; -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
