diff --git a/src/i830_display.c b/src/i830_display.c
index 2e5d55a..01646c2 100644
--- a/src/i830_display.c
+++ b/src/i830_display.c
@@ -115,10 +115,10 @@ typedef struct {
 #define I9XX_M_MAX		    120
 
 /* these two come from the calm1 macro */
-#define I9XX_M1_MIN		     10
-#define I9XX_M1_MAX		     22
-#define I9XX_M2_MIN		      5
-#define I9XX_M2_MAX		      9
+#define I9XX_M1_MIN		    10
+#define I9XX_M1_MAX		    20
+#define I9XX_M2_MIN		    5 
+#define I9XX_M2_MAX		    9 
 
 #define I9XX_P_SDVO_DAC_MIN	      5
 #define I9XX_P_SDVO_DAC_MAX	     80