diff --git a/src/xenia/gpu/d3d11/d3d11_graphics_system.cc b/src/xenia/gpu/d3d11/d3d11_graphics_system.cc
index 2e8993429..68db9311b 100644
--- a/src/xenia/gpu/d3d11/d3d11_graphics_system.cc
+++ b/src/xenia/gpu/d3d11/d3d11_graphics_system.cc
@@ -22,7 +22,7 @@ using namespace xe::gpu::d3d11;
 namespace {
 
 void __stdcall D3D11GraphicsSystemVsyncCallback(D3D11GraphicsSystem* gs, BOOLEAN) {
-  gs->DispatchInterruptCallback();
+  gs->DispatchInterruptCallback(0);
 }
 
 }
@@ -135,7 +135,7 @@ void D3D11GraphicsSystem::Initialize() {
   driver_ = new D3D11GraphicsDriver(memory_, device_);
 
   // Initial vsync kick.
-  DispatchInterruptCallback();
+  DispatchInterruptCallback(0);
 }
 
 void D3D11GraphicsSystem::Pump() {
@@ -145,10 +145,12 @@ void D3D11GraphicsSystem::Pump() {
     // Swap window.
     // If we are set to vsync this will block.
     window_->Swap();
+
+    DispatchInterruptCallback(0);
   } else {
     // If we have gone too long without an interrupt, fire one.
     if (xe_pal_now() - last_interrupt_time_ > 16 / 1000.0) {
-      DispatchInterruptCallback();
+      DispatchInterruptCallback(0);
     }
   }
 }
diff --git a/src/xenia/gpu/graphics_system.cc b/src/xenia/gpu/graphics_system.cc
index d16634b8e..a3787eb31 100644
--- a/src/xenia/gpu/graphics_system.cc
+++ b/src/xenia/gpu/graphics_system.cc
@@ -160,7 +160,8 @@ void GraphicsSystem::WriteRegister(uint32_t r, uint64_t value) {
   regs->values[r].u32 = (uint32_t)value;
 }
 
-void GraphicsSystem::DispatchInterruptCallback(uint32_t cpu) {
+void GraphicsSystem::DispatchInterruptCallback(
+  uint32_t source, uint32_t cpu) {
   // Pick a CPU, if needed. We're going to guess 2. Because.
   if (cpu == 0xFFFFFFFF) {
     cpu = 2;
@@ -172,5 +173,5 @@ void GraphicsSystem::DispatchInterruptCallback(uint32_t cpu) {
     return;
   }
   processor_->ExecuteInterrupt(
-      cpu, interrupt_callback_, 1, interrupt_callback_data_);
+      cpu, interrupt_callback_, source, interrupt_callback_data_);
 }
diff --git a/src/xenia/gpu/graphics_system.h b/src/xenia/gpu/graphics_system.h
index 47cce8211..b24ca995a 100644
--- a/src/xenia/gpu/graphics_system.h
+++ b/src/xenia/gpu/graphics_system.h
@@ -52,7 +52,7 @@ public:
   virtual uint64_t ReadRegister(uint32_t r);
   virtual void WriteRegister(uint32_t r, uint64_t value);
 
-  void DispatchInterruptCallback(uint32_t cpu = 0xFFFFFFFF);
+  void DispatchInterruptCallback(uint32_t source, uint32_t cpu = 0xFFFFFFFF);
   bool swap_pending() const { return swap_pending_; }
   void set_swap_pending(bool value) { swap_pending_ = value; }
 
diff --git a/src/xenia/gpu/nop/nop_graphics_system.cc b/src/xenia/gpu/nop/nop_graphics_system.cc
index b96ab2bd3..ba34ce898 100644
--- a/src/xenia/gpu/nop/nop_graphics_system.cc
+++ b/src/xenia/gpu/nop/nop_graphics_system.cc
@@ -21,7 +21,7 @@ using namespace xe::gpu::nop;
 namespace {
 
 void __stdcall NopGraphicsSystemVsyncCallback(NopGraphicsSystem* gs, BOOLEAN) {
-  gs->DispatchInterruptCallback();
+  gs->DispatchInterruptCallback(0);
 }
 
 }
diff --git a/src/xenia/gpu/ring_buffer_worker.cc b/src/xenia/gpu/ring_buffer_worker.cc
index 470ca06b1..5f7c6e19a 100644
--- a/src/xenia/gpu/ring_buffer_worker.cc
+++ b/src/xenia/gpu/ring_buffer_worker.cc
@@ -289,7 +289,7 @@ uint32_t RingBufferWorker::ExecutePacket(PacketArgs& args) {
           uint32_t cpu_mask = READ_AND_ADVANCE_PTR();
           for (int n = 0; n < 6; n++) {
             if (cpu_mask & (1 << n)) {
-              graphics_system_->DispatchInterruptCallback(n);
+              graphics_system_->DispatchInterruptCallback(1, n);
             }
           }
         }