diff --git a/shared-core/radeon_irq.c b/shared-core/radeon_irq.c
index 1ece639..6875a62 100644
--- a/shared-core/radeon_irq.c
+++ b/shared-core/radeon_irq.c
@@ -153,12 +153,22 @@ static int radeon_driver_vblank_do_wait(struct drm_device * dev,
 	unsigned int cur_vblank;
 	int ret = 0;
 	int ack = 0;
+	int fixup = 0;
+	int saved_crtc;
 	atomic_t *counter;
 	if (!dev_priv) {
 		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
 		return -EINVAL;
 	}
 
+	if (!(radeon_vblank_crtc_get(dev) == crtc)) {
+		return 0;
+		saved_crtc = crtc;
+		fixup = 1;
+		radeon_vblank_crtc_set(dev, crtc);
+		DRM_INFO("Fixup mode !\n");
+	}
+	
 	if (crtc == DRM_RADEON_VBLANK_CRTC1) {
 		counter = &dev->vbl_received;
 		ack |= RADEON_CRTC_VBLANK_STAT;
@@ -182,6 +192,9 @@ static int radeon_driver_vblank_do_wait(struct drm_device * dev,
 
 	*sequence = cur_vblank;
 
+	if (fixup == 1)
+		radeon_vblank_crtc_set(dev, saved_crtc);
+
 	return ret;
 }