ACPI / video: force vendor backlight on Lenovo Ideapad Z570

Lenovo Ideapad 570 is a pre-win8 laptop where not using vendor
backlight causes the backlight controls not to work.

Signed-off-by: Stepan Bujnak <stepanbujnak@fastmail.fm>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index c42feb2bacd0eb783bc94f0e10187d08ea907eea..27c43499977a2a6236e1c3675bf2bb42a314e42f 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -174,6 +174,14 @@ static struct dmi_system_id video_detect_dmi_table[] = {
                DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
                },
        },
+       {
+       .callback = video_detect_force_vendor,
+       .ident = "Lenovo IdeaPad Z570",
+       .matches = {
+               DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+               DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
+               },
+       },
        { },
 };