diff --git a/src/i830_display.c b/src/i830_display.c
index 2e5d55a..ba0558b 100644
--- a/src/i830_display.c
+++ b/src/i830_display.c
@@ -109,16 +109,16 @@ typedef struct {
  * All of the defines here are for the programmed register value, not
  * the 'counter' value (e.g. Ncounter = Nregister + 2)
  */
-#define I9XX_N_MIN		      1
-#define I9XX_N_MAX		      6
+#define I9XX_N_MIN		      3
+#define I9XX_N_MAX		      8
 #define I9XX_M_MIN		     70
 #define I9XX_M_MAX		    120
 
 /* these two come from the calm1 macro */
-#define I9XX_M1_MIN		     10
-#define I9XX_M1_MAX		     22
+#define I9XX_M1_MIN		     11
+#define I9XX_M1_MAX		     20
 #define I9XX_M2_MIN		      5
-#define I9XX_M2_MAX		      9
+#define I9XX_M2_MAX		      8
 
 #define I9XX_P_SDVO_DAC_MIN	      5
 #define I9XX_P_SDVO_DAC_MAX	     80