--- linux-2.4.0-test4/drivers/video/riva/riva_hw.c.orig	Wed Jul  5 19:56:12 2000
+++ linux-2.4.0-test4/drivers/video/riva/riva_hw.c	Mon Jul 24 19:55:32 2000
@@ -1140,7 +1140,10 @@
     outb(offset >> 8, 0x3D5);
     outb(0x19, 0x3D4);
     tmp = inb(0x3D5);
-    outb(((offset >> 16) & 0x0F) | (tmp & 0xF0), 0x3D5);
+    outb(((offset >> 16) & 0x1F) | (tmp & ~0x1F), 0x3D5);
+    outb(0x2D, 0x3D4);
+    tmp = inb(0x3D5);
+    outb(((offset >> 16) & 0x60) | (tmp & ~0x60), 0x3D5);
     /*
      * 4 pixel pan register.
      */