ACPI: disable _OSI(Windows 2009) on Asus K50IJ

Fix a win7 compability issue on Asus K50IJ.

Here is the _BCM method of this laptop:
                    Method (_BCM, 1, NotSerialized)
                    {
                        If (LGreaterEqual (OSFG, OSVT))
                        {
                            If (LNotEqual (OSFG, OSW7))
                            {
                                Store (One, BCMD)
                                Store (GCBL (Arg0), Local0)
                                Subtract (0x0F, Local0, LBTN)
                                ^^^SBRG.EC0.STBR ()
                                ...
                            }
                            Else
                            {
                                DBGR (0x0B, Zero, Zero, Arg0)
                                Store (Arg0, LBTN)
                                ^^^SBRG.EC0.STBR ()
                                ...
                            }
                        }
                    }
LBTN is used to store the index of the brightness level in the _BCL.
GCBL is a method that convert the percentage value to the index value.
If _OSI(Windows 2009) is not disabled, LBTN is stored a percentage
value which is surely beyond the end of _BCL package.

http://bugzilla.kernel.org/show_bug.cgi?id=14753

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index 23e5a0519af5..2815df66f6f7 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -185,6 +185,12 @@ static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
         acpi_osi_setup("!Windows 2006");
         return 0;
 }
+static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)
+{
+        printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
+        acpi_osi_setup("!Windows 2009");
+        return 0;
+}
 
 static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
         {
@@ -211,6 +217,14 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
                      DMI_MATCH(DMI_PRODUCT_NAME, "Sony VGN-SR290J"),
                 },
         },
+        {
+        .callback = dmi_disable_osi_win7,
+        .ident = "ASUS K50IJ",
+        .matches = {
+                     DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+                     DMI_MATCH(DMI_PRODUCT_NAME, "K50IJ"),
+                },
+        },
 
         /*
          * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.