diff -uNrbB linux.bak/lnx_agp.c linux/lnx_agp.c
--- linux.bak/lnx_agp.c	2005-07-03 15:01:32.000000000 +0800
+++ linux/lnx_agp.c	2005-10-16 07:59:55.000000000 +0800
@@ -139,6 +139,8 @@
 		return NULL;
 	}
 
+	memset((char*)&agpinf, 0, sizeof(agpinf));
+
 	if (ioctl(gartFd, AGPIOC_INFO, &agpinf) != 0) {
 		xf86DrvMsg(screenNum, X_ERROR,
 			   "xf86GetAGPInfo: AGPIOC_INFO failed (%s)\n",