This is due to not hiding the cursor during mode switches. The following
patch used to hide the symptoms (not for upstream):

diff --git a/src/aticonsole.c b/src/aticonsole.c
index bd5ec9c..5de0df4 100644
--- a/src/aticonsole.c
+++ b/src/aticonsole.c
@@ -658,6 +658,12 @@ ATISwitchMode
 
 #endif /* XF86DRI_DEVEL */
 
+        /* Workaround for X server hiding the cursor for core cursor, but not
+         * for Xcursor, leaving a 64x64 garbage upper-left.
+         */
+        if (pATI->pCursorInfo)
+           (*pATI->pCursorInfo->HideCursor)(pScreenInfo);
+
         ATIModeSet(pScreenInfo, pATI, &pATI->NewHW);
 
 #ifdef XF86DRI_DEVEL

-- 
[rage] Striped corner and mode switch failure
https://bugs.launchpad.net/bugs/82434
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