Solved display problem when multiple monitor setup changes

2 files changed, 17 insertions, 6 deletions

diff --git a/xorg-server/hw/xwin/winrandr.c b/xorg-server/hw/xwin/winrandr.c
index 248404800..edc946abf 100644
--- a/xorg-server/hw/xwin/winrandr.c
+++ b/xorg-server/hw/xwin/winrandr.c
@@ -70,7 +70,7 @@ winRandRGetInfo (ScreenPtr pScreen, Rotation *pRotations)
   Why can't this be in DIX?
   Does union _Validate vary depending on DDX??
  */
-static void
+void
 xf86SetRootClip (ScreenPtr pScreen, Bool enable)
 {
     WindowPtr	pWin = pScreen->root;
diff --git a/xorg-server/hw/xwin/winwndproc.c b/xorg-server/hw/xwin/winwndproc.c
index 5b2a866a9..8baa25e6d 100644
--- a/xorg-server/hw/xwin/winwndproc.c
+++ b/xorg-server/hw/xwin/winwndproc.c
@@ -47,6 +47,9 @@
 #define XKB_IN_SERVER
 #endif
 #include <xkbsrv.h>
+
+void xf86SetRootClip (ScreenPtr pScreen, Bool enable);
+
 /*
  * Global variables
  */
@@ -313,11 +316,19 @@ winWindowProc (HWND hwnd, UINT message,
 
               winDebug ("winWindowProc - WM_DISPLAYCHANGE - Releasing and recreating primary surface\n");
 
-              /* Release the old primary surface */
-              (*s_pScreenPriv->pwinReleasePrimarySurface) (s_pScreen);
-
-              /* Create the new primary surface */
-              (*s_pScreenPriv->pwinCreatePrimarySurface) (s_pScreen);
+              /* Reallocate the framebuffer used by the drawing engine */
+              (*s_pScreenPriv->pwinFreeFB)(s_pScreen);
+              if (!(*s_pScreenPriv->pwinAllocateFB)(s_pScreen))
+              {
+                ErrorF ("winWindowProc - WM_DISPLAYCHANGE - Could not reallocate framebuffer\n");
+              }
+              /* Update the screen pixmap to point to the new framebuffer */
+              winUpdateFBPointer(s_pScreen, s_pScreenPriv->pScreenInfo->pfb);
+              // Restore the ability to update screen, now with new dimensions
+              xf86SetRootClip(s_pScreen, TRUE);
+
+              // and arrange for it to be repainted
+              miPaintWindow(s_pScreen->root, &s_pScreen->root->borderClip,  PW_BACKGROUND);
             }
 	}