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@xxxxxxxxxxxxxxxxxxxx> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > --- 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@xxxxxxxxxxxxxxx > */ > @@ -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. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
