diff -NurpP xf86-video-ati-6.14.2/src/evergreen_accel.c xf86-video-ati-6.14.2.vsyncfix/src/evergreen_accel.c
--- xf86-video-ati-6.14.2/src/evergreen_accel.c	2011-05-26 00:21:39.000000000 +0000
+++ xf86-video-ati-6.14.2.vsyncfix/src/evergreen_accel.c	2011-08-02 12:25:50.000000000 +0000
@@ -310,6 +310,9 @@ void evergreen_cp_wait_vline_sync(ScrnIn
     if (start > crtc->mode.VDisplay)
         return;
 
+    start += crtc->y;
+    stop += crtc->y;
+
     BEGIN_BATCH(11);
     /* set the VLINE range */
     EREG(EVERGREEN_VLINE_START_END, /* this is just a marker */