From: Ken Thomases <ken@codeweavers.com>
Subject: [PATCH 5/6] winex11: Make GetMonitorInfo() give a different device name (\\.\DISPLAY<n>) to each monitor.
Message-Id: <10F27C22-F146-46A2-A727-9158238FAE47@codeweavers.com>
Date: Thu, 27 Mar 2014 18:18:52 -0500

---
dlls/winex11.drv/xinerama.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/dlls/winex11.drv/xinerama.c b/dlls/winex11.drv/xinerama.c
index 7e28726..42df6da 100644
--- a/dlls/winex11.drv/xinerama.c
+++ b/dlls/winex11.drv/xinerama.c
@@ -30,6 +30,7 @@
 #include "wine/library.h"
 #include "x11drv.h"
 #include "wine/debug.h"
+#include "wine/unicode.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(x11drv);
 
@@ -43,6 +44,7 @@ static MONITORINFOEXW default_monitor =
     MONITORINFOF_PRIMARY,       /* dwFlags */
     { '\\','\\','.','\\','D','I','S','P','L','A','Y','1',0 }   /* szDevice */
 };
+static const WCHAR monitor_deviceW[] = { '\\','\\','.','\\','D','I','S','P','L','A','Y','%','d',0 };
 
 static MONITORINFOEXW *monitors;
 static int nb_monitors;
@@ -127,6 +129,8 @@ static int query_screens(void)
     if (monitors != &default_monitor) HeapFree( GetProcessHeap(), 0, monitors );
     if ((monitors = HeapAlloc( GetProcessHeap(), 0, count * sizeof(*monitors) )))
     {
+        int device = 2; /* 1 is reserved for primary */
+
         nb_monitors = count;
         for (i = 0; i < nb_monitors; i++)
         {
@@ -138,11 +142,15 @@ static int query_screens(void)
             monitors[i].dwFlags          = 0;
             if (!IntersectRect( &monitors[i].rcWork, &rc_work, &monitors[i].rcMonitor ))
                 monitors[i].rcWork = monitors[i].rcMonitor;
-            /* FIXME: using the same device name for all monitors for now */
-            lstrcpyW( monitors[i].szDevice, default_monitor.szDevice );
         }
 
         get_primary()->dwFlags |= MONITORINFOF_PRIMARY;
+
+        for (i = 0; i < nb_monitors; i++)
+        {
+            snprintfW( monitors[i].szDevice, sizeof(monitors[i].szDevice) / sizeof(WCHAR),
+                       monitor_deviceW, monitors[i].dwFlags & MONITORINFOF_PRIMARY ? 1 : device++ );
+        }
     }
     else count = 0;