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SubjectRe: [PATCH v3] Enable A20 using KBC for some MSI laptops to fix S3 resume
On 12/11/2012 12:29 PM, Ondrej Zary wrote:
>
> Something like this? (It works.)
>

Something like that. We need to make sure we send the proper sequence,
though, or it might break some SMM firmware...

> diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
> index d6cc77a..0807ac7 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 +961,13 @@ 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);
> #endif /* CONFIG_X86 */
>
> return retval;
>



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