diff --git a/src/add-ons/accelerants/nvidia/GetTimingConstraints.c b/src/add-ons/accelerants/nvidia/GetTimingConstraints.c
index 29751b96c8..2b00bbbf87 100644
--- a/src/add-ons/accelerants/nvidia/GetTimingConstraints.c
+++ b/src/add-ons/accelerants/nvidia/GetTimingConstraints.c
@@ -1,7 +1,6 @@
 /*
-	Authors:
-	Mark Watson - 21/6/00,
-	Apsed
+	Author:
+	Rudolf Cornelissen 7/2004
 */
 
 #define MODULE_BIT 0x01000000
@@ -11,20 +10,24 @@
 /* Used to help generate mode lines */
 status_t GET_TIMING_CONSTRAINTS(display_timing_constraints * dtc) 
 {
-	// apsed, TODO, is that following card capabilities ?? 
-	LOG(4, ("GET_TIMING_CONSTRAINTS\n"));
-	
-	dtc->h_res=8;
-	dtc->h_sync_min=8;
-	dtc->h_sync_max=248;
-	dtc->h_blank_min=8;
-	dtc->h_blank_max=504;
-	
-	dtc->v_res=1;
-	dtc->v_sync_min=1;
-	dtc->v_sync_max=15;
-	dtc->v_blank_min=1;
-	dtc->v_blank_max=255;
+	LOG(4, ("GET_TIMING_CONSTRAINTS: returning info\n"));
+
+	/* specs are identical for all nVidia cards */
+	dtc->h_res = 8;
+	dtc->h_sync_min = 8;
+	dtc->h_sync_max = 248;
+	/* Note:
+	 * h_blank info is used to determine the max. diff. between h_total and h_display! */
+	dtc->h_blank_min = 8;
+	dtc->h_blank_max = 1016;
+
+	dtc->v_res = 1;
+	dtc->v_sync_min = 1;
+	dtc->v_sync_max = 15;
+	/* Note:
+	 * v_blank info is used to determine the max. diff. between v_total and v_display! */
+	dtc->v_blank_min = 1;
+	dtc->v_blank_max = 255;
 
 	return B_OK;
 }
diff --git a/src/add-ons/accelerants/nvidia/engine/nv_crtc.c b/src/add-ons/accelerants/nvidia/engine/nv_crtc.c
index 0e08943d45..a591777e98 100644
--- a/src/add-ons/accelerants/nvidia/engine/nv_crtc.c
+++ b/src/add-ons/accelerants/nvidia/engine/nv_crtc.c
@@ -1,6 +1,6 @@
 /* CTRC functionality */
 /* Author:
-   Rudolf Cornelissen 11/2002-6/2004
+   Rudolf Cornelissen 11/2002-7/2004
 */
 
 #define MODULE_BIT 0x00040000
@@ -41,6 +41,9 @@ status_t nv_crtc_validate_timing(
 	/* if hor. total does not leave room for a sensible sync pulse, increase it! */
 	if (*ht < (*hd_e + 80)) *ht = (*hd_e + 80);
 
+	/* if hor. total does not adhere to max. blanking pulse width, decrease it! */
+	if (*ht > (*hd_e + 0x3f8)) *ht = (*hd_e + 0x3f8);
+
 	/* make sure sync pulse is not during display */
 	if (*hs_e > (*ht - 8)) *hs_e = (*ht - 8);
 	if (*hs_s < (*hd_e + 8)) *hs_s = (*hd_e + 8);
@@ -71,6 +74,9 @@ status_t nv_crtc_validate_timing(
 	/*if vertical total does not leave room for a sync pulse, increase it!*/
 	if (*vt < (*vd_e + 3)) *vt = (*vd_e + 3);
 
+	/* if vert. total does not adhere to max. blanking pulse width, decrease it! */
+	if (*vt > (*vd_e + 0xff)) *vt = (*vd_e + 0xff);
+
 	/* make sure sync pulse is not during display */
 	if (*vs_e > (*vt - 1)) *vs_e = (*vt - 1);
 	if (*vs_s < (*vd_e + 1)) *vs_s = (*vd_e + 1);
diff --git a/src/add-ons/accelerants/nvidia/engine/nv_crtc2.c b/src/add-ons/accelerants/nvidia/engine/nv_crtc2.c
index b310396b43..f5988af7fb 100644
--- a/src/add-ons/accelerants/nvidia/engine/nv_crtc2.c
+++ b/src/add-ons/accelerants/nvidia/engine/nv_crtc2.c
@@ -1,6 +1,6 @@
 /* second CTRC functionality for GeForce cards */
 /* Author:
-   Rudolf Cornelissen 11/2002-6/2004
+   Rudolf Cornelissen 11/2002-7/2004
 */
 
 #define MODULE_BIT 0x00020000
@@ -34,6 +34,9 @@ status_t nv_crtc2_validate_timing(
 	/* if hor. total does not leave room for a sensible sync pulse, increase it! */
 	if (*ht < (*hd_e + 80)) *ht = (*hd_e + 80);
 
+	/* if hor. total does not adhere to max. blanking pulse width, decrease it! */
+	if (*ht > (*hd_e + 0x3f8)) *ht = (*hd_e + 0x3f8);
+
 	/* make sure sync pulse is not during display */
 	if (*hs_e > (*ht - 8)) *hs_e = (*ht - 8);
 	if (*hs_s < (*hd_e + 8)) *hs_s = (*hd_e + 8);
@@ -57,6 +60,9 @@ status_t nv_crtc2_validate_timing(
 	/*if vertical total does not leave room for a sync pulse, increase it!*/
 	if (*vt < (*vd_e + 3)) *vt = (*vd_e + 3);
 
+	/* if vert. total does not adhere to max. blanking pulse width, decrease it! */
+	if (*vt > (*vd_e + 0xff)) *vt = (*vd_e + 0xff);
+
 	/* make sure sync pulse is not during display */
 	if (*vs_e > (*vt - 1)) *vs_e = (*vt - 1);
 	if (*vs_s < (*vd_e + 1)) *vs_s = (*vd_e + 1);