ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807

The GIGABYTE GB-BXBT-2807 is a mini-PC which uses off the shelf
components, like an Intel GPU which is meant for mobile systems.
As such, it, by default, has a backlight controller exposed.

Unfortunately, the backlight controller only confuses userspace, which
sees the existence of a backlight device node and has the unrealistic
belief that there is actually a backlight there!

Add a DMI quirk to force the backlight off on this system.
Signed-off-by: Jasper St. Pierre <jstpierre@mecheye.net>
Reviewed-by: Chris Chiu <chiu@endlessos.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/video_detect.c

@@ -140,6 +140,13 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
 	},
 	{
 	.callback = video_detect_force_vendor,
+	.ident = "GIGABYTE GB-BXBT-2807",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
+		},
+	},
+	{
 	.ident = "Sony VPCEH3U1E",
 	.matches = {
 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),