--- qpaintdevice_x11.cpp.old    2007-04-02 07:53:32.000000000 -0500
+++ qpaintdevice_x11.cpp        2007-04-02 07:55:03.000000000 -0500
@@ -526,11 +526,16 @@
     Q_CHECK_PTR( dpisX );
     Q_CHECK_PTR( dpisY );
     for ( i = 0; i < screens; i++ ) {
-       dpisX[ i ] = (DisplayWidth(dpy,i) * 254 + DisplayWidthMM(dpy,i)*5)
-
-                    / (DisplayWidthMM(dpy,i)*10);
-       dpisY[ i ] = (DisplayHeight(dpy,i) * 254 + DisplayHeightMM(dpy,i)*5)
-                    / (DisplayHeightMM(dpy,i)*10);
+       if (DisplayWidthMM(dpy,i) < 1)
+               dpisX[ i ] = 75; // default the dpi to 75.
+       else
+               dpisX[ i ] = (DisplayWidth(dpy,i) * 254 + DisplayWidthMM(dpy,i)*5)
+                     / (DisplayWidthMM(dpy,i)*10);
+       if (DisplayHeightMM(dpy,i) < 1)
+               dpisY[ i ] = 75; // default the dpi to 75.
+       else
+               dpisY[ i ] = (DisplayHeight(dpy,i) * 254 + DisplayHeightMM(dpy,i)*5)
+                     / (DisplayHeightMM(dpy,i)*10);
     }
 }