--- xf86-video-ati/src/radeon_driver.c.orig	2006-06-01 04:37:05.627170608 +0800
+++ xf86-video-ati/src/radeon_driver.c	2006-06-01 04:40:25.834734432 +0800
@@ -3019,6 +3019,11 @@
 #ifdef RENDER
     info->RenderAccel = xf86ReturnOptValBool (info->Options,
 					      OPTION_RENDER_ACCEL, TRUE);
+    if ((info->Chipset == PCI_CHIP_RN50_515E) ||
+        (info->Chipset == PCI_CHIP_RN50_5969)) {
+        info->RenderAccel = FALSE;
+	xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Disable Render Acceleration for RN50 \n");
+    }
 #endif
 
     return TRUE;