diff -urN a/src/mesa/drivers/dri/radeon/radeon_blit.c b/src/mesa/drivers/dri/radeon/radeon_blit.c
--- a/src/mesa/drivers/dri/radeon/radeon_blit.c	2012-03-22 17:10:07.000000000 +0000
+++ b/src/mesa/drivers/dri/radeon/radeon_blit.c	2012-07-02 17:51:07.327986222 +0100
@@ -102,8 +102,8 @@
     uint32_t txformat = RADEON_TXFORMAT_NON_POWER2;
     BATCH_LOCALS(&r100->radeon);
 
-    assert(width <= 2047);
-    assert(height <= 2047);
+    assert(width <= 2048);
+    assert(height <= 2048);
     assert(offset % 32 == 0);
 
     /* XXX others?  BE/LE? */