Index: /trunk/src/VBox/Devices/Graphics/DevVGA.cpp
===================================================================
--- /trunk/src/VBox/Devices/Graphics/DevVGA.cpp	(revision 35024)
+++ /trunk/src/VBox/Devices/Graphics/DevVGA.cpp	(revision 35025)
@@ -971,4 +971,5 @@
             {
                 s->vbe_regs[s->vbe_index] = val;
+                s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] = val;
                 fRecalculate = true;
             }