--- xf86-video-ati/src/radeon_dri.c.orig	2006-06-01 04:40:43.289080968 +0800
+++ xf86-video-ati/src/radeon_dri.c	2006-06-01 04:45:06.257103752 +0800
@@ -1367,6 +1367,11 @@
     } else    
     if ( info->ChipFamily >= CHIP_FAMILY_R200 )
        pDRIInfo->clientDriverName	 = R200_DRIVER_NAME;
+    else if ((info->Chipset == PCI_CHIP_RN50_515E) || 
+             (info->Chipset == PCI_CHIP_RN50_5969)) {
+        /* RN50 doesn't support 3D, so setting clientDriverName to an invalid name "RN50" */
+        pDRIInfo->clientDriverName       = "RN50";          
+    }
     else 
        pDRIInfo->clientDriverName	 = RADEON_DRIVER_NAME;