File ovmf-MdeModulePkg-ConSplitterDxe-Set-default-ConOut-mode.patch of Package ovmf

From cbb3afd30ac427bd0efb17222f6d9beb1d260156 Mon Sep 17 00:00:00 2001
From: Richard Lyu <richard.lyu@suse.com>
Date: Tue, 18 Nov 2025 17:29:13 +0800
Subject: [PATCH] MdeModulePkg/ConSplitterDxe: Set default ConOut mode to 0

REF: https://github.com/tianocore/edk2/issues/11765

The ConSplitterDxe driver was defaulting to the Console Output
(ConOut) MaxMode immediately after its virtual protocols were
installed. This MaxMode often exceeded the actual resolution
or capability of the physical console device, leading to severe
display corruption and incorrect line wrapping/positioning. This
commit changes the default mode to 0, guaranteeing stable display
behavior upon system boot.

Signed-off-by: Richard Lyu <richard.lyu@suse.com>
---
 MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitter.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitter.c b/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitter.c
index a3fa8f8e5e36..a4f455e25959 100644
--- a/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitter.c
+++ b/MdeModulePkg/Universal/Console/ConSplitterDxe/ConSplitter.c
@@ -1346,6 +1346,11 @@ ConSplitterConOutDriverBindingStart (
     FreePool (Info);
   }
 
+  Status = gST->ConOut->SetMode (gST->ConOut, 0);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
   return Status;
 }
 
-- 
2.51.0