diff --git a/src/add-ons/accelerants/matrox/SetDisplayMode.c b/src/add-ons/accelerants/matrox/SetDisplayMode.c
index b8150ad7a2..2b79155c24 100644
--- a/src/add-ons/accelerants/matrox/SetDisplayMode.c
+++ b/src/add-ons/accelerants/matrox/SetDisplayMode.c
@@ -396,12 +396,11 @@ status_t SET_DISPLAY_MODE(display_mode *mode_to_set)
 		}
 		else
 		{
+			gx00_maven_shutoff_vid_pll();
 			gx00_crtc_set_timing(target);
 		}
-
-		//fixme: shut-off the videoPLL when applicable, if it exists...
 	}
-	
+
 	/* update driver's mode store */
 	si->dm = target;
 
diff --git a/src/add-ons/accelerants/matrox/engine/mga_maven.c b/src/add-ons/accelerants/matrox/engine/mga_maven.c
index 21afadf3c4..f14178c7c3 100644
--- a/src/add-ons/accelerants/matrox/engine/mga_maven.c
+++ b/src/add-ons/accelerants/matrox/engine/mga_maven.c
@@ -2,7 +2,7 @@
 
 /* Authors:
    Mark Watson 6/2000,
-   Rudolf Cornelissen 1/2003-12/2003
+   Rudolf Cornelissen 1/2003-5/2006
 
    Thanx to Petr Vandrovec for writing matroxfb.
 */
@@ -226,6 +226,21 @@ status_t gx00_maven_mode(int mode,float brightness)
 	return B_OK;
 }
 
+void gx00_maven_shutoff_vid_pll()
+{
+	switch (si->ps.card_type)
+	{
+		case G100:
+		case G200:
+		case G400:
+		case G400MAX:
+			MAVW(PIXPLLP, ((MAVR(PIXPLLP)) & ~0x80));
+			break;
+		default:
+			break;
+	}
+}
+
 status_t gx00_maven_set_vid_pll(display_mode target)
 {
 	switch (si->ps.card_type)
diff --git a/src/add-ons/accelerants/matrox/engine/mga_proto.h b/src/add-ons/accelerants/matrox/engine/mga_proto.h
index b8921592b3..a7482073d3 100644
--- a/src/add-ons/accelerants/matrox/engine/mga_proto.h
+++ b/src/add-ons/accelerants/matrox/engine/mga_proto.h
@@ -70,6 +70,7 @@ status_t g100_g400max_maven_vid_pll_find(display_mode target,float * calc_pclk,
 				uint8 * m_result,uint8 * n_result,uint8 * p_result);
 status_t g450_g550_maven_vid_pll_find(display_mode target,float * calc_pclk,
 				uint8 * m_result,uint8 * n_result,uint8 * p_result, uint8 test);
+void gx00_maven_shutoff_vid_pll(void);
 status_t gx00_maven_set_vid_pll(display_mode target);
 
 /*MAVENTV functions*/