--- xserver-xorg-driver-ati-6.5.7.3/src/r128_video.c	2005-07-11 03:29:45.000000000 +0100
+++ r128_video.c.rad640	2006-04-04 03:25:04.000000000 +0100
@@ -624,7 +624,7 @@
 
     R128ECP(pScrn, pPriv);
 
-    v_inc = (src_h << 20) / drw_h;
+    v_inc = ((src_h * pScrn->currentMode->CrtcVDisplay / info->PanelYRes) << 20) / (drw_h + 1);
     h_inc = (src_w << (12 + pPriv->ecp_div)) / drw_w;
     step_by = 1;
 
@@ -696,7 +696,7 @@
     int p1_h_accum_init, p23_h_accum_init;
     int p1_v_accum_init, p23_v_accum_init;
 
-    v_inc = (src_h << 20) / drw_h;
+    v_inc = ((src_h * pScrn->currentMode->CrtcVDisplay / info->PanelYRes) << 20) / (drw_h + 1);
     h_inc = (src_w << (12 + pPriv->ecp_div)) / drw_w;
     step_by = 1;