--- xc.orig/programs/Xserver/hw/xfree86/drivers/ati/r128.h	2004-08-08 14:22:29.000000000 +0200
+++ xc/programs/Xserver/hw/xfree86/drivers/ati/r128.h	2004-08-08 15:11:32.996891824 +0200
@@ -314,6 +314,8 @@
     unsigned char     *AGP;             /* Map */
     int               agpMode;
 
+    CARD32            pciCommand;
+
     Bool              CCEInUse;         /* CCE is currently active */
     int               CCEMode;          /* CCE mode that server/clients use */
     int               CCEFifoSize;      /* Size of the CCE command FIFO */
--- xc.orig/programs/Xserver/hw/xfree86/drivers/ati/r128_dri.c	2004-08-08 14:22:29.000000000 +0200
+++ xc/programs/Xserver/hw/xfree86/drivers/ati/r128_dri.c	2004-08-08 15:11:32.999891368 +0200
@@ -440,6 +440,9 @@
     int           flags;
     unsigned long agpBase;
 
+				/* Save the old PCI command reg */
+    info->pciCommand = pciReadLong(info->PciTag, PCI_CMD_STAT_REG);
+
     if (drmAgpAcquire(info->drmFD) < 0) {
 	xf86DrvMsg(pScreen->myNum, X_WARNING, "[agp] AGP not available\n");
 	return FALSE;
@@ -623,6 +626,11 @@
 
     OUTREG(R128_PCI_GART_PAGE, 1); /* Ensure AGP GART is used (for now) */
 
+				/* Enable bus mastering in PCI config
+				   space */
+    pciWriteLong(info->PciTag, PCI_CMD_STAT_REG,
+		 info->pciCommand | PCI_CMD_MASTER_ENABLE);
+
     return TRUE;
 }
 
@@ -1333,6 +1341,9 @@
 	drmAgpFree(info->drmFD, info->agpMemHandle);
 	info->agpMemHandle = DRM_AGP_NO_HANDLE;
 	drmAgpRelease(info->drmFD);
+
+				/* Restore PCI command register */
+	pciWriteLong(info->PciTag, PCI_CMD_STAT_REG, info->pciCommand);
     }
     if (info->pciMemHandle) {
 	drmScatterGatherFree(info->drmFD, info->pciMemHandle);