1 files changed, 9 insertions, 1 deletions
diff --git a/DuetPkg/BiosVideoThunkDxe/BiosVideo.c b/DuetPkg/BiosVideoThunkDxe/BiosVideo.c
index 6a8e55a034..7053a0002c 100644
--- a/DuetPkg/BiosVideoThunkDxe/BiosVideo.c
+++ b/DuetPkg/BiosVideoThunkDxe/BiosVideo.c
@@ -1043,6 +1043,7 @@ BiosVideoCheckForVbe (
   VESA_BIOS_EXTENSIONS_VALID_EDID_TIMING ValidEdidTiming;
   EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE      *GraphicsOutputMode;
 
+  DEBUG ((EFI_D_INFO, "Enter BiosVideoCheckForVbe()\n"));
   //
   // Allocate buffer under 1MB for VBE data structures
   //
@@ -1095,26 +1096,33 @@ BiosVideoCheckForVbe (
   Regs.X.ES = EFI_SEGMENT ((UINTN) BiosVideoPrivate->VbeInformationBlock);
   Regs.X.DI = EFI_OFFSET ((UINTN) BiosVideoPrivate->VbeInformationBlock);
 
+  DEBUG ((EFI_D_INFO, "Before VESA!\n"));
   LegacyBiosInt86 (BiosVideoPrivate, 0x10, &Regs);
-  
+  DEBUG ((EFI_D_INFO, "Call VESA! Return Status=0x%X\n", Regs.X.AX));
+  DEBUG ((EFI_D_INFO, "Call VESA! VESA Signature =0x%X\n", BiosVideoPrivate->VbeInformationBlock->VESASignature));
+  DEBUG ((EFI_D_INFO, "Call VESA! VESA Version =0x%X\n", BiosVideoPrivate->VbeInformationBlock->VESAVersion));
+    
   Status = EFI_DEVICE_ERROR;
 
   //
   // See if the VESA call succeeded
   //
   if (Regs.X.AX != VESA_BIOS_EXTENSIONS_STATUS_SUCCESS) {
+    DEBUG ((EFI_D_INFO, "Fail to call VESA! Status=0x%X\n", Regs.X.AX));
     return Status;
   }
   //
   // Check for 'VESA' signature
   //
   if (BiosVideoPrivate->VbeInformationBlock->VESASignature != VESA_BIOS_EXTENSIONS_VESA_SIGNATURE) {
+    DEBUG ((EFI_D_INFO, "Fail to check VESA signature!\n"));
     return Status;
   }
   //
   // Check to see if this is VBE 2.0 or higher
   //
   if (BiosVideoPrivate->VbeInformationBlock->VESAVersion < VESA_BIOS_EXTENSIONS_VERSION_2_0) {
+    DEBUG ((EFI_D_INFO, "VBE version is little than 2.0!\n"));
     return Status;
   }