diff --git a/hw/kdrive/fbdev/fbdev.c b/hw/kdrive/fbdev/fbdev.c
index fd14afa92..d6fcf1a5f 100644
--- a/hw/kdrive/fbdev/fbdev.c
+++ b/hw/kdrive/fbdev/fbdev.c
@@ -465,15 +465,19 @@ fbdevRandRSetConfig(ScreenPtr pScreen,
     int oldheight;
     int oldmmwidth;
     int oldmmheight;
-    int newwidth, newheight;
+    int newwidth, newheight, newmmwidth, newmmheight;
 
     if (screen->randr & (RR_Rotate_0 | RR_Rotate_180)) {
         newwidth = pSize->width;
         newheight = pSize->height;
+        newmmwidth = pSize->mmWidth;
+        newmmheight = pSize->mmHeight;
     }
     else {
         newwidth = pSize->height;
         newheight = pSize->width;
+        newmmwidth = pSize->mmHeight;
+        newmmheight = pSize->mmWidth;
     }
 
     if (wasEnabled)
@@ -491,6 +495,10 @@ fbdevRandRSetConfig(ScreenPtr pScreen,
      */
 
     scrpriv->randr = KdAddRotation(screen->randr, randr);
+    pScreen->width = newwidth;
+    pScreen->height = newheight;
+    pScreen->mmWidth = newmmwidth;
+    pScreen->mmHeight = newmmheight;
 
     fbdevUnmapFramebuffer(screen);