ACPI / video: Favor native backlight interface for ThinkPad Helix

Like many other Windows 8 laptops the ThinkPad Helix's backlight has a
broken ACPI interface and can only be properly adjusted by using the
video card's native backlight control. This adds the ThinkPad Helix to
the list of laptops affected with this issue so that
video.use_native_backlight is enabled by default.

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 48c7e8af9c96cba545731cb0ab464cb4097dc44b..8b6990e417ec870d7c77e42c994b1e2245b3b88e 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -487,6 +487,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
                DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
                },
        },
+       {
+       .callback = video_set_use_native_backlight,
+       .ident = "Thinkpad Helix",
+       .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+               DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
+               },
+       },
        {
         .callback = video_set_use_native_backlight,
         .ident = "Dell Inspiron 7520",