diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 10704d5..c3c39a1 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -176,6 +176,8 @@ static void intel_crt_dpms(struct drm_connector *connector, int mode)
 
 		intel_crtc_update_dpms(crtc);
 	}
+
+	intel_connector_check_state(to_intel_connector(connector));
 }
 
 static int intel_crt_mode_valid(struct drm_connector *connector,
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e453c3a..b3c4151 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3561,6 +3561,41 @@ void intel_encoder_dpms(struct intel_encoder *encoder, int mode)
 	}
 }
 
+/* Cross check the actual hw state with our own modeset state tracking (and it's
+ * internal consistency). */
+void intel_connector_check_state(struct intel_connector *connector)
+{
+	if (connector->get_hw_state(connector)) {
+		struct intel_encoder *encoder = connector->encoder;
+		struct drm_crtc *crtc;
+		bool encoder_enabled;
+		enum pipe pipe;
+
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
+			      connector->base.base.id,
+			      drm_get_connector_name(&connector->base));
+
+		WARN(connector->base.dpms == DRM_MODE_DPMS_OFF,
+		     "wrong connector dpms state\n");
+		WARN(connector->base.encoder != &encoder->base,
+		     "active connector not linked to encoder\n");
+		WARN(!encoder->connectors_active,
+		     "encoder->connectors_active not set\n");
+
+		encoder_enabled = encoder->get_hw_state(encoder, &pipe);
+		WARN(!encoder_enabled, "encoder not enabled\n");
+		if (WARN_ON(!encoder->base.crtc))
+			return;
+
+		crtc = encoder->base.crtc;
+
+		WARN(!crtc->enabled, "crtc not enabled\n");
+		WARN(!to_intel_crtc(crtc)->active, "crtc not active\n");
+		WARN(pipe != to_intel_crtc(crtc)->pipe,
+		     "encoder active on the wrong pipe\n");
+	}
+}
+
 /* Even simpler default implementation, if there's really no special case to
  * consider. */
 void intel_connector_dpms(struct drm_connector *connector, int mode)
@@ -3581,6 +3616,8 @@ void intel_connector_dpms(struct drm_connector *connector, int mode)
 		intel_encoder_dpms(encoder, mode);
 	else
 		encoder->connectors_active = false;
+
+	intel_connector_check_state(to_intel_connector(connector));
 }
 
 /* Simple connector->get_hw_state implementation for encoders that support only
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b201c7e..aff262e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1365,6 +1365,8 @@ intel_dp_dpms(struct drm_connector *connector, int mode)
 		intel_encoder_dpms(&intel_dp->base, mode);
 		WARN_ON(intel_dp->dpms_mode != DRM_MODE_DPMS_ON);
 	}
+
+	intel_connector_check_state(to_intel_connector(connector));
 }
 
 /*
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index af7865e..220be82 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -434,6 +434,7 @@ extern void intel_encoder_destroy(struct drm_encoder *encoder);
 extern void intel_encoder_dpms(struct intel_encoder *encoder, int mode);
 extern void intel_connector_dpms(struct drm_connector *, int mode);
 extern bool intel_connector_get_hw_state(struct intel_connector *connector);
+extern void intel_connector_check_state(struct intel_connector *);
 
 static inline struct intel_encoder *intel_attached_encoder(struct drm_connector *connector)
 {
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index e9397b7..17dc8be 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -188,6 +188,8 @@ static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 
 		intel_crtc_update_dpms(crtc);
 	}
+
+	intel_connector_check_state(to_intel_connector(connector));
 }
 
 static int intel_dvo_mode_valid(struct drm_connector *connector,
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 96501bd..19b47ac 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1271,6 +1271,8 @@ static void intel_sdvo_dpms(struct drm_connector *connector, int mode)
 			intel_sdvo_set_encoder_power_state(intel_sdvo, mode);
 		intel_sdvo_set_active_outputs(intel_sdvo, intel_sdvo->attached_output);
 	}
+
+	intel_connector_check_state(to_intel_connector(connector));
 }
 
 static int intel_sdvo_mode_valid(struct drm_connector *connector,
