diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 18bd0af855dc..e27c17012628 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -427,6 +427,25 @@ blind_set:
 	goto end;
 }
 
+static void intel_setup_cadls(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_opregion *opregion = &dev_priv->opregion;
+	int i = 0;
+	u32 disp_id;
+
+	/* Initialize the CADL field by duplicating the DIDL values.
+	 * Technically, this is not always correct as display outputs may exist,
+	 * but not active. This initialization is necessary for some Clevo
+	 * laptops that check this field before processing the brightness and
+	 * display switching hotkeys. Just like DIDL, CADL is NULL-terminated if
+	 * there are less than eight devices. */
+	do {
+		disp_id = ioread32(&opregion->acpi->didl[i]);
+		iowrite32(disp_id, &opregion->acpi->cadl[i]);
+	} while (++i < 8 && disp_id != 0);
+}
+
 void intel_opregion_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -436,8 +455,10 @@ void intel_opregion_init(struct drm_device *dev)
 		return;
 
 	if (opregion->acpi) {
-		if (drm_core_check_feature(dev, DRIVER_MODESET))
+		if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 			intel_didl_outputs(dev);
+			intel_setup_cadls(dev);
+		}
 
 		/* Notify BIOS we are ready to handle ACPI video ext notifs.
 		 * Right now, all the events are handled by the ACPI video module.