diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 30d8fd03fec7..97b711e57bff 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -70,11 +70,7 @@ module_param(device_id_scheme, bool, 0444);
 static int only_lcd = -1;
 module_param(only_lcd, int, 0444);
 
-/*
- * Display probing is known to take up to 5 seconds, so delay the fallback
- * backlight registration by 5 seconds + 3 seconds for some extra margin.
- */
-static int register_backlight_delay = 8;
+static int register_backlight_delay;
 module_param(register_backlight_delay, int, 0444);
 MODULE_PARM_DESC(register_backlight_delay,
 	"Delay in seconds before doing fallback (non GPU driver triggered) "
@@ -2176,6 +2172,17 @@ static bool should_check_lcd_flag(void)
 	return false;
 }
 
+/*
+ * At least one graphics driver has reported that no LCD is connected
+ * via the native interface. cancel the registration for fallback acpi_video0.
+ * If another driver still deems this necessary, it can explicitly register it.
+ */
+void acpi_video_report_nolcd(void)
+{
+	cancel_delayed_work(&video_bus_register_backlight_work);
+}
+EXPORT_SYMBOL(acpi_video_report_nolcd);
+
 int acpi_video_register(void)
 {
 	int ret = 0;
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index f27914aedbd5..16dcd31d124f 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -432,10 +432,24 @@ static const struct dmi_system_id asus_laptop[] = {
 			DMI_MATCH(DMI_BOARD_NAME, "S5602ZA"),
 		},
 	},
+	{
+		.ident = "Asus ExpertBook B2502",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_BOARD_NAME, "B2502CBA"),
+		},
+	},
 	{ }
 };
 
-static const struct dmi_system_id lenovo_82ra[] = {
+static const struct dmi_system_id lenovo_laptop[] = {
+	{
+		.ident = "LENOVO IdeaPad Flex 5 14ALC7",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "82R9"),
+		},
+	},
 	{
 		.ident = "LENOVO IdeaPad Flex 5 16ALC7",
 		.matches = {
@@ -446,6 +460,17 @@ static const struct dmi_system_id lenovo_82ra[] = {
 	{ }
 };
 
+static const struct dmi_system_id schenker_gm_rg[] = {
+	{
+		.ident = "XMG CORE 15 (M22)",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
+			DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"),
+		},
+	},
+	{ }
+};
+
 struct irq_override_cmp {
 	const struct dmi_system_id *system;
 	unsigned char irq;
@@ -458,8 +483,9 @@ struct irq_override_cmp {
 static const struct irq_override_cmp override_table[] = {
 	{ medion_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
 	{ asus_laptop, 1, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, false },
-	{ lenovo_82ra, 6, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
-	{ lenovo_82ra, 10, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
+	{ lenovo_laptop, 6, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
+	{ lenovo_laptop, 10, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW, 0, true },
+	{ schenker_gm_rg, 1, ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_LOW, 1, true },
 };
 
 static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index a934bbc9dd37..1b78c7434492 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -34,6 +34,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
+#include <linux/pnp.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
 #include <acpi/video.h>
@@ -105,6 +106,26 @@ static bool nvidia_wmi_ec_supported(void)
 }
 #endif
 
+static bool apple_gmux_backlight_present(void)
+{
+	struct acpi_device *adev;
+	struct device *dev;
+
+	adev = acpi_dev_get_first_match_dev(GMUX_ACPI_HID, NULL, -1);
+	if (!adev)
+		return false;
+
+	dev = acpi_get_first_physical_node(adev);
+	if (!dev)
+		return false;
+
+	/*
+	 * drivers/platform/x86/apple-gmux.c only supports old style
+	 * Apple GMUX with an IO-resource.
+	 */
+	return pnp_get_resource(to_pnp_dev(dev), IORESOURCE_IO, 0) != NULL;
+}
+
 /* Force to use vendor driver when the ACPI device is known to be
  * buggy */
 static int video_detect_force_vendor(const struct dmi_system_id *d)
@@ -767,7 +788,7 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 	if (nvidia_wmi_ec_present)
 		return acpi_backlight_nvidia_wmi_ec;
 
-	if (apple_gmux_present())
+	if (apple_gmux_backlight_present())
 		return acpi_backlight_apple_gmux;
 
 	/* Use ACPI video if available, except when native should be preferred. */
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 77277d90b6e2..a7eb13902af8 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4360,6 +4360,10 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
 		amdgpu_set_panel_orientation(&aconnector->base);
 	}
 
+	/* If we didn't find a panel, notify the acpi video detection */
+	if (dm->adev->flags & AMD_IS_APU && dm->num_of_edps == 0)
+		acpi_video_report_nolcd();
+
 	/* Software is initialized. Now we can register interrupt handlers. */
 	switch (adev->asic_type) {
 #if defined(CONFIG_DRM_AMD_DC_SI)
diff --git a/include/acpi/video.h b/include/acpi/video.h
index a275c35e5249..8ed9bec03e53 100644
--- a/include/acpi/video.h
+++ b/include/acpi/video.h
@@ -53,6 +53,7 @@ enum acpi_backlight_type {
 };
 
 #if IS_ENABLED(CONFIG_ACPI_VIDEO)
+extern void acpi_video_report_nolcd(void);
 extern int acpi_video_register(void);
 extern void acpi_video_unregister(void);
 extern void acpi_video_register_backlight(void);
@@ -69,6 +70,7 @@ extern int acpi_video_get_levels(struct acpi_device *device,
 				 struct acpi_video_device_brightness **dev_br,
 				 int *pmax_level);
 #else
+static inline void acpi_video_report_nolcd(void) { return; };
 static inline int acpi_video_register(void) { return -ENODEV; }
 static inline void acpi_video_unregister(void) { return; }
 static inline void acpi_video_register_backlight(void) { return; }