Index: ntoskrnl/io/iomgr/device.c
===================================================================
--- ntoskrnl/io/iomgr/device.c	(révision 57783)
+++ ntoskrnl/io/iomgr/device.c	(copie de travail)
@@ -275,12 +275,14 @@
                                OBJ_KERNEL_HANDLE,
                                NULL,
                                NULL);
+    DPRINT1("IopGetDeviceObjectPointer - calling ZwOpenFile\n");
     Status = ZwOpenFile(&FileHandle,
                         DesiredAccess,
                         &ObjectAttributes,
                         &StatusBlock,
                         0,
                         FILE_NON_DIRECTORY_FILE | AttachFlag);
+    DPRINT1("IopGetDeviceObjectPointer - ZwOpenFile returned Status = %lu\n", Status);
     if (!NT_SUCCESS(Status)) return Status;
 
     /* Get File Object */
Index: ntoskrnl/io/iomgr/file.c
===================================================================
--- ntoskrnl/io/iomgr/file.c	(révision 57783)
+++ ntoskrnl/io/iomgr/file.c	(copie de travail)
@@ -1846,6 +1846,7 @@
      * status, which is in the Open Packet's Final Status, and determined
      * by the Parse Check member.
      */
+    DPRINT1("IoCreateFile - calling ObOpenObjectByName\n");
     Status = ObOpenObjectByName(ObjectAttributes,
                                 NULL,
                                 AccessMode,
@@ -1853,6 +1854,7 @@
                                 DesiredAccess,
                                 &OpenPacket,
                                 &LocalHandle);
+    DPRINT1("IoCreateFile - ObOpenObjectByName returned Status = %lu\n", Status);
 
     /* Free the EA Buffer */
     if (OpenPacket.EaBuffer) ExFreePool(OpenPacket.EaBuffer);
Index: ntoskrnl/ob/obhandle.c
===================================================================
--- ntoskrnl/ob/obhandle.c	(révision 57783)
+++ ntoskrnl/ob/obhandle.c	(copie de travail)
@@ -2500,6 +2500,7 @@
         goto Cleanup;
     }
 
+    DPRINT1("ObOpenObjectByName - calling ObpLookupObjectName\n");
     /* Now do the lookup */
     Status = ObpLookupObjectName(TempBuffer->ObjectCreateInfo.RootDirectory,
                                  &ObjectName,
@@ -2512,6 +2513,7 @@
                                  PassedAccessState,
                                  &TempBuffer->LookupContext,
                                  &Object);
+    DPRINT1("ObOpenObjectByName - ObpLookupObjectName returned Status = %lu\n", Status);
     if (!NT_SUCCESS(Status))
     {
         /* Cleanup after lookup */
Index: ntoskrnl/vdm/vdmmain.c
===================================================================
--- ntoskrnl/vdm/vdmmain.c	(révision 57783)
+++ ntoskrnl/vdm/vdmmain.c	(copie de travail)
@@ -48,6 +48,8 @@
     UCHAR KeyValueInfo[sizeof(KEY_VALUE_BASIC_INFORMATION) + 30];
     ULONG ReturnLength;
 
+    DPRINT1("Enter KeI386VdmInitialize\n");
+
     /* Make sure that there is a WOW key */
     RtlInitUnicodeString(&Name,
                          L"\\Registry\\Machine\\System\\CurrentControlSet\\"
@@ -74,6 +76,7 @@
         if (KeGetPcr()->Prcb->FeatureBits & KF_V86_VIS)
         {
             /* Enable them. FIXME: Use IPI */
+            DPRINT1("KeI386VdmInitialize - KeI386VirtualIntExtensions = TRUE\n");
             Ki386VdmEnablePentiumExtentions(TRUE);
             KeI386VirtualIntExtensions = TRUE;
         }
Index: win32ss/gdi/eng/device.c
===================================================================
--- win32ss/gdi/eng/device.c	(révision 57783)
+++ win32ss/gdi/eng/device.c	(copie de travail)
@@ -9,7 +9,7 @@
 
 #include <win32k.h>
 
-#define NDEBUG
+//#define NDEBUG
 #include <debug.h>
 
 PGRAPHICS_DEVICE gpPrimaryGraphicsDevice;
@@ -63,8 +63,10 @@
         DPRINT1("ExAllocatePoolWithTag failed\n");
         return NULL;
     }
+    DPRINT1("EngpRegisterGraphicsDevice - ExAllocatePoolWithTag succeeded, pGraphicsDevice = 0x%p\n", pGraphicsDevice);
 
     /* Try to open the driver */
+    DPRINT1("EngpRegisterGraphicsDevice - calling IoGetDeviceObjectPointer(%wZ, ..., address_of_(pFileObject = 0x%p), address_of_(pDeviceObject = 0x%p)\n", pustrDeviceName, pFileObject, pDeviceObject);
     Status = IoGetDeviceObjectPointer(pustrDeviceName,
                                       FILE_READ_DATA | FILE_WRITE_DATA,
                                       &pFileObject,
@@ -75,8 +77,10 @@
         ExFreePoolWithTag(pGraphicsDevice, GDITAG_GDEVICE);
         return NULL;
     }
+    DPRINT1("EngpRegisterGraphicsDevice - IoGetDeviceObjectPointer succeeded, Status = %lu\n", Status);
 
     /* Enable the device */
+    DPRINT("EngpRegisterGraphicsDevice - calling EngFileWrite\n");
     EngFileWrite(pFileObject, &bEnable, sizeof(BOOL), &cj);
 
     /* Copy the device and file object pointers */
@@ -91,6 +95,7 @@
 
     /* Create a win device name (FIXME: virtual devices!) */
     swprintf(pGraphicsDevice->szWinDeviceName, L"\\\\.\\DISPLAY%d", (int)giDevNum);
+    DPRINT("EngpRegisterGraphicsDevice - pGraphicsDevice->szWinDeviceName = '%S'\n", pGraphicsDevice->szWinDeviceName);
 
     /* Allocate a buffer for the strings */
     cj = pustrDiplayDrivers->Length + pustrDescription->Length + sizeof(WCHAR);
@@ -103,18 +108,21 @@
         return NULL;
     }
 
+    DPRINT("EngpRegisterGraphicsDevice - ckeckpt 1\n");
     /* Copy display driver names */
     pGraphicsDevice->pDiplayDrivers = pwsz;
     RtlCopyMemory(pGraphicsDevice->pDiplayDrivers,
                   pustrDiplayDrivers->Buffer,
                   pustrDiplayDrivers->Length);
 
+    DPRINT("EngpRegisterGraphicsDevice - ckeckpt 2\n");
     /* Copy description */
     pGraphicsDevice->pwszDescription = pwsz + pustrDiplayDrivers->Length / sizeof(WCHAR);
     RtlCopyMemory(pGraphicsDevice->pwszDescription,
                   pustrDescription->Buffer,
                   pustrDescription->Length + sizeof(WCHAR));
 
+    DPRINT("EngpRegisterGraphicsDevice - ckeckpt 3\n");
     /* Initialize the pdevmodeInfo list and default index  */
     pGraphicsDevice->pdevmodeInfo = NULL;
     pGraphicsDevice->iDefaultMode = 0;
@@ -216,6 +224,7 @@
         }
      }
 
+     DPRINT("EngpRegisterGraphicsDevice - ckeckpt 3\n");
     /* Lock loader */
     EngAcquireSemaphore(ghsemGraphicsDeviceList);
 
Index: win32ss/user/ntuser/display.c
===================================================================
--- win32ss/user/ntuser/display.c	(révision 57783)
+++ win32ss/user/ntuser/display.c	(copie de travail)
@@ -86,6 +86,8 @@
         return NULL;
     }
 
+    ERR("InitDisplayDriver - Checkpt 1\n");
+
     /* Query the diplay drivers */
     cbSize = sizeof(awcBuffer) - 10;
     Status = RegQueryValue(hkey,
@@ -109,6 +111,8 @@
     ustrDescription.Buffer = awcBuffer + (cbSize / sizeof(WCHAR));
     cbSize = sizeof(awcBuffer) - cbSize;
 
+    ERR("InitDisplayDriver - Checkpt 2\n");
+
     /* Query the device string */
     Status = RegQueryValue(hkey,
                            L"Device Description",
@@ -136,6 +140,8 @@
     /* Close the registry key */
     ZwClose(hkey);
 
+    ERR("InitDisplayDriver - Checkpt 3\n");
+
     /* Register the device with GDI */
     RtlInitUnicodeString(&ustrDeviceName, pwszDeviceName);
     pGraphicsDevice = EngpRegisterGraphicsDevice(&ustrDeviceName,
@@ -147,6 +153,8 @@
         pGraphicsDevice->StateFlags |= DISPLAY_DEVICE_VGA_COMPATIBLE;
     }
 
+    ERR("InitDisplayDriver - Checkpt 4\n");
+
     return pGraphicsDevice;
 }
 
@@ -162,7 +170,7 @@
     ULONG cbValue;
     HKEY hkey;
 
-    TRACE("----------------------------- InitVideo() -------------------------------\n");
+    ERR("----------------------------- InitVideo() -------------------------------\n");
 
     /* Open the key for the boot command line */
     Status = RegOpenKey(L"\\REGISTRY\\MACHINE\\SYSTEM\\CurrentControlSet\\Control", &hkey);
@@ -224,6 +232,7 @@
         }
 
         /* Initialize the driver for this device */
+        ERR("InitVideo - calling InitDisplayDriver\n");
         pGraphicsDevice = InitDisplayDriver(awcDeviceName, awcBuffer);
         if (!pGraphicsDevice) continue;
 
@@ -279,6 +288,7 @@
         }
     }
 
+    ERR("InitVideo - calling InitSysParams\n");
     InitSysParams();
 
     return 1;
Index: win32ss/user/ntuser/ntuser.c
===================================================================
--- win32ss/user/ntuser/ntuser.c	(révision 57783)
+++ win32ss/user/ntuser/ntuser.c	(copie de travail)
@@ -109,8 +109,14 @@
     if (!NT_SUCCESS(Status)) return Status;
 
     /* Initialize Video. */
+    ERR("UserInitialize - calling InitVideo\n");
     Status = InitVideo();
-    if (!NT_SUCCESS(Status)) return Status;
+    if (!NT_SUCCESS(Status))
+    {
+        ERR("UserInitialize - failed when calling InitVideo, Status = %lu\n", Status);
+        return Status;
+    }
+    ERR("UserInitialize - calling InitVideo succeeded, Status = %lu\n", Status);
 
 // {
 //     DrvInitConsole.