Switching video modes via Ctrl-Alt-+/- and xvidtune normally wraps around from
the largest to the smallest resolutions.  However, after switching to a lower
resolution using xrandr, this no longer happens - zooming out from the largest
resolution or in from the smallest does nothing.

I believe this is due to XF86VidModeSwitchMode attempting to switch a resolution
larger than the current server size set by xrandr; so it silently fails.  My
simple solution is to keep trying modes as long as the resolution does not
change; if no other resolution works, eventually it will wrap to the current
resolution and do nothing.

The following patch implements this change:

diff -pur xorg-server-1.1.1/hw/xfree86/common/xf86Cursor.c
xorg-server-1.1.1-mine/hw/xfree86/common/xf86Cursor.c
--- xorg-server-1.1.1/hw/xfree86/common/xf86Cursor.c  2006-07-05
14:31:40.000000000 -0400
+++ xorg-server-1.1.1-mine/hw/xfree86/common/xf86Cursor.c   2006-10-12
13:01:49.000000000 -0400
@@ -295,13 +295,17 @@ xf86ZoomViewport(ScreenPtr pScreen, int 
     return;

   do {
-    if (zoom > 0)
-      mode = mode->next;
-    else
-      mode = mode->prev;
-  } while (mode != pScr->currentMode && !(mode->type & M_T_USERDEF));
+     do {
+       if (zoom > 0)
+         mode = mode->next;
+       else
+         mode = mode->prev;
+     } while (mode != pScr->currentMode && !(mode->type & M_T_USERDEF));
+
+
+     (void)xf86SwitchMode(pScreen, mode);
+  } while(mode != pScr->currentMode);

-  (void)xf86SwitchMode(pScreen, mode);
 }