--- trident_video.c	2006-11-03 17:31:54.000000000 +0100
+++ trident_video_new.c	2008-01-07 21:20:29.000000000 +0100
@@ -113,7 +113,7 @@
 
     if (pTrident->Chipset == CYBER9397DVD || 
 	pTrident->Chipset == CYBER9525DVD ||
-	pTrident->Chipset >= BLADE3D)
+	(pTrident->Chipset >= BLADE3D && pTrident->Chipset < CYBERBLADEXP4))
 		pTrident->videoFlags |= VID_DOUBLE_LINEBUFFER_FOR_WIDE_SRC;
 
     newAdaptor = TRIDENTSetupImageVideo(pScreen);