--- zzzz-none-000/linux-3.10.107/include/acpi/video.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/acpi/video.h	2021-02-04 17:41:59.000000000 +0000
@@ -16,11 +16,21 @@
 #define ACPI_VIDEO_DISPLAY_LEGACY_PANEL   0x0110
 #define ACPI_VIDEO_DISPLAY_LEGACY_TV      0x0200
 
-#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
+enum acpi_backlight_type {
+	acpi_backlight_undef = -1,
+	acpi_backlight_none = 0,
+	acpi_backlight_video,
+	acpi_backlight_vendor,
+	acpi_backlight_native,
+};
+
+#if IS_ENABLED(CONFIG_ACPI_VIDEO)
 extern int acpi_video_register(void);
 extern void acpi_video_unregister(void);
 extern int acpi_video_get_edid(struct acpi_device *device, int type,
 			       int device_id, void **edid);
+extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
+extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
 #else
 static inline int acpi_video_register(void) { return 0; }
 static inline void acpi_video_unregister(void) { return; }
@@ -29,6 +39,13 @@
 {
 	return -ENODEV;
 }
+static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
+{
+	return acpi_backlight_vendor;
+}
+static inline void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
+{
+}
 #endif
 
 #endif