On Tuesday, December 11, 2012 04:45:31 PM H. Peter Anvin wrote: > Looks good to me. Alan/Rafael/Dmitry, OK for me to commit this? No objections from me. Thanks, Rafael > On 12/11/2012 01:18 PM, 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 in i8042_platform_init for x86. > > > > Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 > > > > Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> > > --- > > drivers/input/serio/i8042-x86ia64io.h | 9 +++++++++ > > 1 files changed, 9 insertions(+), 0 deletions(-) > > > > diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h > > index d6cc77a..5f306f7 100644 > > --- a/drivers/input/serio/i8042-x86ia64io.h > > +++ b/drivers/input/serio/i8042-x86ia64io.h > > @@ -921,6 +921,7 @@ static int __init i8042_platform_init(void) > > int retval; > > > > #ifdef CONFIG_X86 > > + u8 a20_on = 0xdf; > > /* Just return if pre-detection shows no i8042 controller exist */ > > if (!x86_platform.i8042_detect()) > > return -ENODEV; > > @@ -960,6 +961,14 @@ static int __init i8042_platform_init(void) > > > > if (dmi_check_system(i8042_dmi_dritek_table)) > > i8042_dritek = true; > > + > > + /* > > + * A20 was already enabled during early kernel init. But some buggy > > + * BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to > > + * resume from S3. So we do it here and hope that nothing breaks. > > + */ > > + i8042_command(&a20_on, 0x10d1); > > + i8042_command(NULL, 0x00ff); /* Null command for SMM firmware */ > > #endif /* CONFIG_X86 */ > > > > return retval; > > > -- 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
