diff --git a/Core/HLE/sceDisplay.cpp b/Core/HLE/sceDisplay.cpp
index e494e3e74e..7056903cc7 100644
--- a/Core/HLE/sceDisplay.cpp
+++ b/Core/HLE/sceDisplay.cpp
@@ -259,6 +259,13 @@ void sceDisplayWaitVblankStartCB()
 	__KernelCheckCallbacks();
 }
 
+void sceDisplayWaitVblankStartMultiCB()
+{
+	DEBUG_LOG(HLE,"sceDisplayWaitVblankStartMultiCB()");	
+	__KernelWaitCurThread(WAITTYPE_VBLANK, 0, 0, 0, true);
+	__KernelCheckCallbacks();
+}
+
 void sceDisplayGetVcount()
 {
 	// Too spammy
@@ -297,7 +304,7 @@ const HLEFunction sceDisplay[] =
 	{0x984C27E7,sceDisplayWaitVblankStart, "sceDisplayWaitVblankStart"},
 	{0x8EB9EC49,sceDisplayWaitVblankCB, "sceDisplayWaitVblankCB"},
 	{0x46F186C3,sceDisplayWaitVblankStartCB, "sceDisplayWaitVblankStartCB"},
-	{0x77ed8b3a,0,"sceDisplayWaitVblankStartMultiCB"},
+	{0x77ed8b3a,sceDisplayWaitVblankStartMultiCB,"sceDisplayWaitVblankStartMultiCB"},
 
 	{0xdba6c4c4,&WrapF_V<sceDisplayGetFramePerSec>,"sceDisplayGetFramePerSec"},
 	{0x773dd3a3,sceDisplayGetCurrentHcount,"sceDisplayGetCurrentHcount"},
diff --git a/Core/HLE/sceUmd.cpp b/Core/HLE/sceUmd.cpp
index 2eb6a27c27..c7b521e399 100644
--- a/Core/HLE/sceUmd.cpp
+++ b/Core/HLE/sceUmd.cpp
@@ -149,7 +149,7 @@ u32 sceUmdGetDriveStat()
 void sceUmdWaitDriveStat()
 {
 	u32 stat = PARAM(0);
-	ERROR_LOG(HLE,"UNIMPL 0=sceUmdWaitDriveStat(stat = %08x)", stat);
+	DEBUG_LOG(HLE,"HACK 0=sceUmdWaitDriveStat(stat = %08x)", stat);
 	if ((stat & __KernelUmdGetState()) != stat)
 		__KernelWaitCurThread(WAITTYPE_UMD, 0, stat, 0, 0);	//__KernelWaitCurThread(WAITTYPE_UMD, 0);
 	RETURN(0);
@@ -159,18 +159,17 @@ void sceUmdWaitDriveStatWithTimer()
 {
 	u32 stat = PARAM(0);
 	u32 timeout = PARAM(1);
-	ERROR_LOG(HLE,"UNIMPL 0=sceUmdWaitDriveStatWithTimer(stat = %08x)", stat);
+	DEBUG_LOG(HLE,"HACK 0=sceUmdWaitDriveStatWithTimer(stat = %08x)", stat);
 	if ((stat & __KernelUmdGetState()) != stat)
 		__KernelWaitCurThread(WAITTYPE_UMD, 0, stat, 0, 0);	//__KernelWaitCurThread(WAITTYPE_UMD, 0);
-	RETURN(stat);
+	RETURN(0);
 }
 
 
 void sceUmdWaitDriveStatCB()
 {
 	u32 stat = PARAM(0);
-	ERROR_LOG(HLE,"UNIMPL 0=sceUmdWaitDriveStatCB(stat = %08x)", stat);
-	//__KernelRegisterCallback(THREAD_CALLBACK_UMD, cbid);
+	DEBUG_LOG(HLE,"HACK 0=sceUmdWaitDriveStatCB(stat = %08x)", stat);
    // Immediately notify
     RETURN(0);
    __KernelNotifyCallbackType(THREAD_CALLBACK_UMD, driveCBId, __KernelUmdGetState()&stat);