diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index e63619da2e62..34b8a54f95a3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2923,6 +2923,14 @@ static void intel_set_transcoder_timings_lrr(const struct intel_crtc_state *crtc
 	crtc_vblank_start = adjusted_mode->crtc_vblank_start;
 	crtc_vblank_end = adjusted_mode->crtc_vblank_end;
 
+	if (DISPLAY_VER(dev_priv) >= 13) {
+		/*
+		 * VBLANK_START not used by hw, just clear it
+		 * to make it stand out in register dumps.
+		 */
+		crtc_vblank_start = 1;
+	}
+
 	drm_WARN_ON(&dev_priv->drm, adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE);
 
 	/*