diff -aur xc/programs/Xserver/hw/xfree86/loader/xf86sym.c xc-new/programs/Xserver/hw/xfree86/loader/xf86sym.c
--- xc/programs/Xserver/hw/xfree86/loader/xf86sym.c	2005-04-30 09:59:13.062097392 -0400
+++ xc-new/programs/Xserver/hw/xfree86/loader/xf86sym.c	2005-04-30 10:08:33.757858680 -0400
@@ -293,6 +293,7 @@
     SYMFUNC(xf86AllocateGARTMemory)
     SYMFUNC(xf86BindGARTMemory)
     SYMFUNC(xf86UnbindGARTMemory)
+    SYMFUNC(xf86DeallocateGARTMemory)
     SYMFUNC(xf86EnableAGP)
     SYMFUNC(xf86SoundKbdBell)
     SYMFUNC(xf86GARTCloseScreen)
diff -aur xc/programs/Xserver/hw/xfree86/os-support/linux/lnx_agp.c xc-new/programs/Xserver/hw/xfree86/os-support/linux/lnx_agp.c
--- xc/programs/Xserver/hw/xfree86/os-support/linux/lnx_agp.c	2005-04-30 09:09:03.000000000 -0400
+++ xc-new/programs/Xserver/hw/xfree86/os-support/linux/lnx_agp.c	2005-04-30 10:06:49.063774600 -0400
@@ -319,6 +319,29 @@
 	return TRUE;
 }
 
+Bool
+xf86DeallocateGARTMemory(int screenNum, int key)
+{
+    if (!GARTInit(screenNum) || acquiredScreen != screenNum)
+        return FALSE;
+
+    if (acquiredScreen != screenNum) {
+        xf86DrvMsg(screenNum, X_ERROR,
+                   "xf86UnbindGARTMemory: AGP not acquired by this screen\n");
+        return FALSE;
+    }
+
+    if (ioctl(gartFd, AGPIOC_DEALLOCATE, (char *)key) != 0) {
+        xf86DrvMsg(screenNum, X_WARNING,"xf86DeAllocateGARTMemory: "
+                   "deallocation gart memory with key %d failed\n\t(%s)\n",
+                   key, strerror(errno));
+        return FALSE;
+    }
+
+    return TRUE;
+    
+}
+
 
 /* XXX Interface may change. */
 Bool
diff -aur xc/programs/Xserver/hw/xfree86/os-support/shared/agp_noop.c xc-new/programs/Xserver/hw/xfree86/os-support/shared/agp_noop.c
--- xc/programs/Xserver/hw/xfree86/os-support/shared/agp_noop.c	2005-04-30 09:09:09.000000000 -0400
+++ xc-new/programs/Xserver/hw/xfree86/os-support/shared/agp_noop.c	2005-04-30 10:07:48.766698376 -0400
@@ -91,6 +91,13 @@
 	return FALSE;
 }
 
+
+Bool
+xf86DeallocateGARTMemory(int screenNum, int key)
+{
+    return FALSE;
+}
+
 Bool
 xf86EnableAGP(int screenNum, CARD32 mode)
 {
diff -aur xc/programs/Xserver/hw/xfree86/os-support/xf86_OSproc.h xc-new/programs/Xserver/hw/xfree86/os-support/xf86_OSproc.h
--- xc/programs/Xserver/hw/xfree86/os-support/xf86_OSproc.h	2005-04-30 09:08:54.000000000 -0400
+++ xc-new/programs/Xserver/hw/xfree86/os-support/xf86_OSproc.h	2005-04-30 10:06:39.772187136 -0400
@@ -196,6 +196,7 @@
 				  unsigned long *physical);
 extern Bool xf86BindGARTMemory(int screenNum, int key, unsigned long offset);
 extern Bool xf86UnbindGARTMemory(int screenNum, int key);
+extern Bool xf86DeallocateGARTMemory(int screenNum, int key);
 extern Bool xf86EnableAGP(int screenNum, CARD32 mode);
 extern Bool xf86GARTCloseScreen(int screenNum);