diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 3b5b9e7b05b7b..3156dc3591d8b 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2359,6 +2359,14 @@ intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
 		    "DP dual mode adaptor (%s) detected (max TMDS clock: %d kHz)\n",
 		    drm_dp_get_dual_mode_type_name(type),
 		    hdmi->dp_dual_mode.max_tmds_clock);
+
+	/* Older VBTs are often buggy and can't be trusted :( Play it safe. */
+	if ((DISPLAY_VER(dev_priv) >= 8 || IS_HASWELL(dev_priv)) &&
+	    !intel_bios_is_port_dp_dual_mode(dev_priv, port)) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "Ignoring DP dual mode adaptor max TMDS clock for native HDMI port\n");
+		hdmi->dp_dual_mode.max_tmds_clock = 0;
+	}
 }
 
 static bool