From 9c75c1e6fd6fae957aad28dae47a3f279f2dcfad Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Tue, 8 Apr 2014 22:20:33 -0700
Subject: [PATCH] Avoid triggering SYNC ge signals.

Fixes #5806, bcause it avoids rescheduling at the signal, which it should
not do.  Possibly this is incorrect for all GE signals, but we don't need
to trigger any behavior on a sync anyway.
---
 GPU/GPUCommon.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/GPU/GPUCommon.cpp b/GPU/GPUCommon.cpp
index 1bda70320d..9040b9ea6e 100644
--- a/GPU/GPUCommon.cpp
+++ b/GPU/GPUCommon.cpp
@@ -823,6 +823,10 @@ void GPUCommon::ExecuteOp(u32 op, u32 diff) {
 					ERROR_LOG_REPORT(G3D, "Signal with Pause UNIMPLEMENTED! signal/end: %04x %04x", signal, enddata);
 					break;
 				case PSP_GE_SIGNAL_SYNC:
+					// Technically, this ought to trigger an interrupt, but it won't do anything.
+					// Triggering here can cause incorrect rescheduling, which breaks 3rd Birthday.
+					// However, this is likely a bug in how GE signal interrupts are handled.
+					trigger = false;
 					currentList->signal = behaviour;
 					DEBUG_LOG(G3D, "Signal with Sync. signal/end: %04x %04x", signal, enddata);
 					break;