diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 5e9f93e53255613b05545e74d4ad251188344c5c..3acec8c4816606f1f2aa82bbe0ad3f5c105f4ad5 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -149,7 +149,7 @@ static void intel_enable_crt(struct intel_encoder *encoder)
 	intel_crt_set_dpms(encoder, crt->connector->base.dpms);
 }
 
-
+/* Special dpms function to support cloning between dvo/sdvo/crt. */
 static void intel_crt_dpms(struct drm_connector *connector, int mode)
 {
 	struct drm_device *dev = connector->dev;
@@ -180,6 +180,8 @@ static void intel_crt_dpms(struct drm_connector *connector, int mode)
 	else
 		encoder->connectors_active = true;
 
+	/* We call connector dpms manually below in case pipe dpms doesn't
+	 * change due to cloning. */
 	if (mode < old_dpms) {
 		/* From off to on, enable the pipe first. */
 		intel_crtc_update_dpms(crtc);
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 9e80d487b5cbebcddc285a21cd768eaeefa0c5d7..eb2020eb2b7ea1c60dde15062c426182e30d9d05 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -180,6 +180,7 @@ static void intel_enable_dvo(struct intel_encoder *encoder)
 	intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 }
 
+/* Special dpms function to support cloning between dvo/sdvo/crt. */
 static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 {
 	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
@@ -201,6 +202,8 @@ static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 		return;
 	}
 
+	/* We call connector dpms manually below in case pipe dpms doesn't
+	 * change due to cloning. */
 	if (mode == DRM_MODE_DPMS_ON) {
 		intel_dvo->base.connectors_active = true;
 
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 4d4a3f0cadfba0754efc9a547d6424ea9a1a4242..7068195376ef0c7ab2a912d08d45ece43d3b488d 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1416,6 +1416,7 @@ static void intel_enable_sdvo(struct intel_encoder *encoder)
 	intel_sdvo_set_active_outputs(intel_sdvo, intel_sdvo->attached_output);
 }
 
+/* Special dpms function to support cloning between dvo/sdvo/crt. */
 static void intel_sdvo_dpms(struct drm_connector *connector, int mode)
 {
 	struct drm_crtc *crtc;
@@ -1437,6 +1438,8 @@ static void intel_sdvo_dpms(struct drm_connector *connector, int mode)
 		return;
 	}
 
+	/* We set active outputs manually below in case pipe dpms doesn't change
+	 * due to cloning. */
 	if (mode != DRM_MODE_DPMS_ON) {
 		intel_sdvo_set_active_outputs(intel_sdvo, 0);
 		if (0)