From f9066dca73dead69687f9e4e048ec480403e9bdc Mon Sep 17 00:00:00 2001
From: Leonard Hecker <lhecker@microsoft.com>
Date: Thu, 13 Aug 2026 00:49:11 +0200
Subject: [PATCH] ConPTY: Do not wait for DA1 on startup (#20536)

A counterpart to #20510. After this commit you can spawn ConPTY
again without handling any queries and it'll (mostly) just work.

(cherry picked from commit bfc054685cb3e1cd07fdf294a294f266934e3d1b)
Service-Card-Id: PVTI_lADOAF3p4s4BQX0-zg2Hrj8
Service-Version: 1.25
---
 src/host/VtIo.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/host/VtIo.cpp b/src/host/VtIo.cpp
index f5214d3817..f03ef64e2b 100644
--- a/src/host/VtIo.cpp
+++ b/src/host/VtIo.cpp
@@ -206,11 +206,14 @@ bool VtIo::IsUsingVt() const
             writer.Submit();
         }
 
+        // NOTE: The PTY host may not be a terminal and may never respond
+        // to our DA1 request. It's better to not wait for a response.
+        if (_lookingForCursorPosition)
         {
             // Allow the input thread to momentarily gain the console lock.
             auto& gci = ServiceLocator::LocateGlobals().getConsoleInformation();
             const auto suspension = gci.SuspendLock();
-            _deviceAttributes = _pVtInputThread->WaitUntilDA1(3000);
+            _deviceAttributes = _pVtInputThread->WaitUntilDA1(1000);
         }
     }