diff --git a/src/radeon.h b/src/radeon.h
index 2944fe8..b1a0b1c 100644
--- a/src/radeon.h
+++ b/src/radeon.h
@@ -1149,6 +1149,20 @@ do {									\
 	    info->cp->needCacheFlush = FALSE;				\
 	}								\
 	RADEON_WAIT_UNTIL_IDLE();					\
+	if (info->ChipFamily <= CHIP_FAMILY_RV280) {			\
+	    BEGIN_RING(6);						\
+	    OUT_RING_REG(RADEON_RE_TOP_LEFT, 0);			\
+	    OUT_RING_REG(RADEON_RE_WIDTH_HEIGHT, ((0x7ff << RADEON_RE_WIDTH_SHIFT) | \
+						  (0x7ff << RADEON_RE_HEIGHT_SHIFT))); \
+	    OUT_RING_REG(RADEON_AUX_SC_CNTL, 0);			\
+	    ADVANCE_RING();						\
+	} else {							\
+	    BEGIN_RING(4);						\
+	    OUT_RING_REG(R300_SC_SCISSOR0, 0);				\
+	    OUT_RING_REG(R300_SC_SCISSOR1, ((8191 << R300_SCISSOR_X_SHIFT) | \
+					    (8191 << R300_SCISSOR_Y_SHIFT))); \
+	    ADVANCE_RING();						\
+	}								\
 	info->cp->CPInUse = TRUE;					\
     }									\
 } while (0)