Windows ignores everything but the lower 16 bits of system io accesses. Enable compatibility with it if the firmware indicates Windows compatibility by requesting a version of Windows via the _OSI method. Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx> --- drivers/acpi/bus.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 743576b..a10144b 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -904,6 +904,14 @@ static int __init acpi_bus_init(void) goto error1; } + /* + * _SB_._INI has been called, so any _OSI requests should now have + * been completed - enable any OS-specific workarounds + */ + + if (acpi_gbl_osi_data >= ACPI_OSI_WIN_2000) + acpi_gbl_ignore_high_ioport_bits = TRUE; + acpi_early_processor_set_pdc(); /* -- 1.7.0.1 -- 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
