ACPI / video: disable native backlight for ThinkPad X201s

commit 789eeea128925741e0a105357bebf8855d3bcdee upstream.

The ThinkPad X201s has a working ACPI video backlight interface and is
shipped before Win8; then there is BIOS update that starts to query
_OSI("Windows 2012") and that would make our video module stop creating
backlight interface and caused problem for the user. Add it to the DMI
table to disable native backlight to fix this problem.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=81691
Link: https://bugzilla.kernel.org/show_bug.cgi?id=51231
Reported-and-tested-by: Yves-Alexis Perez <corsac@debian.org>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 4834b4cae54085100243ac9e012c910b79e987a5..f1e3496c00c77f8ad749efdc546b59444c6151e5 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -675,6 +675,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
                },
        },
+       {
+        .callback = video_disable_native_backlight,
+        .ident = "ThinkPad X201s",
+        .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+               DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
+               },
+       },
 
        /* The native backlight controls do not work on some older machines */
        {