From fb1eefdd5e0fb4bce89634aba61196263cc91979 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Tue, 15 Oct 2013 11:08:51 -0400
Subject: [PATCH] do not call AudioEngine::set_driver() when the backend does
 not require driver selection

---
 gtk2_ardour/engine_dialog.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 47a2506f92..d20cbd3da9 100644
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -1273,7 +1273,9 @@ EngineControl::EngineControl ()
 			    of settings.
 			 */
 			 change_driver = true;
-			 change_device = true;
+			 if (backend->requires_driver_selection()) {
+				 change_device = true;
+			 }
 			 change_rate = true;
 			 change_bufsize = true;
 			 change_channels = true;