diff --git a/build/components/hyena.TWL/src/main.c b/build/components/hyena.TWL/src/main.c
index 8a29c0f4..dc1f8269 100644
--- a/build/components/hyena.TWL/src/main.c
+++ b/build/components/hyena.TWL/src/main.c
@@ -122,7 +122,7 @@ TwlSpMain(void)
     PrintDebugInfo();
 
     // PXIコールバックの設定
-//  PXI_SetFifoRecvCallback( SYSMENU_PXI_FIFO_TAG, SYSMi_PXIFifoRecvCallback );
+    SYSM_InitPXI();
 
     // ランチャーパラメター取得（Cold/Hotスタート判定含む）
     ReadLauncherParameter();
diff --git a/build/libraries_sysmenu/sysmenu/ARM9/src/device.c b/build/libraries_sysmenu/sysmenu/ARM9/src/device.c
index 04de3aa9..b2e020e6 100644
--- a/build/libraries_sysmenu/sysmenu/ARM9/src/device.c
+++ b/build/libraries_sysmenu/sysmenu/ARM9/src/device.c
@@ -46,7 +46,8 @@ void SYSM_SetBackLightBrightness( u8 brightness )
 	if( brightness > LCFG_TWL_BACKLIGHT_LEVEL_MAX ) {
 		OS_Panic( "Backlight brightness over : %d\n", brightness );
 	}
-	( void )PMi_WriteRegister( 0x20, (u16)brightness );
+	( void )SYSMi_SendPXICommand( SYSM_PXI_COMM_BL_BRIGHT, brightness );
+	
 	LCFG_TSD_SetBacklightBrightness( brightness );
 	
 	// [TODO:] バックライト輝度は毎回セーブせずに、アプリ起動やリセット、電源OFF時に値が変わっていたらセーブするようにする。
diff --git a/build/libraries_sysmenu/sysmenu/common/include/internal_api.h b/build/libraries_sysmenu/sysmenu/common/include/internal_api.h
index a95c7734..3362975f 100644
--- a/build/libraries_sysmenu/sysmenu/common/include/internal_api.h
+++ b/build/libraries_sysmenu/sysmenu/common/include/internal_api.h
@@ -2,7 +2,7 @@
   Project:  TwlIPL
   File:     internal_api.h
 
-  Copyright 2007 Nintendo.  All rights reserved.
+  Copyright 2007-2008 Nintendo.  All rights reserved.
 
   These coded instructions, statements, and computer programs contain
   proprietary information of Nintendo of America Inc. and/or Nintendo
@@ -19,6 +19,7 @@
 #define SYSM_INTERNAL_API_H_
 
 #include <twl.h>
+#include <sysmenu/sysmenu_lib/common/pxi.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -78,8 +79,6 @@ void SYSMi_EnableHotSW( BOOL enable );
 //=======================================================
 BOOL SYSMi_IsDebuggerBannerViewMode( void );
 BOOL SYSMi_CheckEntryAddress( void );
-BOOL SYSMi_SendPXICommand( SYSMPXICommand command );
-void SYSMi_PXIFifoRecvCallback( PXIFifoTag tag, u32 data, BOOL err );
 
 
 #ifdef __cplusplus
diff --git a/build/libraries_sysmenu/sysmenu/common/src/pxi.c b/build/libraries_sysmenu/sysmenu/common/src/pxi.c
index d14b2192..6b6049a9 100644
--- a/build/libraries_sysmenu/sysmenu/common/src/pxi.c
+++ b/build/libraries_sysmenu/sysmenu/common/src/pxi.c
@@ -16,6 +16,7 @@
  *---------------------------------------------------------------------------*/
 
 #include <twl.h>
+#include <twl/mcu.h>
 #include <sysmenu.h>
 #include "internal_api.h"
 
@@ -27,8 +28,8 @@
 typedef union SYSMPXIPacket {
 	struct {
 		u16 data;
-		u16 command : 14;
-		u16 stat : 2;
+		u8  cmd;  // PXI_FIFOMESSAGE_BITSZ_DATA = 26
+		u8  stat : 2;
 	};
 	u32 raw;
 }SYSMPXIPacket;
@@ -38,31 +39,73 @@ typedef union SYSMPXIPacket {
 // function's prototype-------------------------------------------------------
 // global variable-------------------------------------------------------------
 // static variable-------------------------------------------------------------
-static volatile BOOL s_sending = FALSE;
+static volatile BOOL s_sending[SYSM_PXI_COMM_NUM];
 // const data------------------------------------------------------------------
 
+// PXI初期化
+void SYSM_InitPXI( void )
+{
+    static BOOL isInitialized;
+    int i;
+
+    if (isInitialized)
+    {
+        return;
+    }
+    isInitialized = TRUE;
+
+    for (i=0; i<SYSM_PXI_COMM_NUM; i++)
+    {
+        s_sending[i] = FALSE;
+    }
+
+    //---- setting PXI
+    PXI_Init();
+#ifdef SDK_ARM9
+    while (!PXI_IsCallbackReady(SYSMENU_PXI_FIFO_TAG, PXI_PROC_ARM7))
+    {
+    }
+#endif // SDK_ARM9
+    PXI_SetFifoRecvCallback(SYSMENU_PXI_FIFO_TAG, SYSMi_PXIFifoRecvCallback);
+}
+
 // PXIコマンド送信
-BOOL SYSMi_SendPXICommand( SYSMPXICommand command )
+BOOL SYSMi_TrySendPXICommand( SYSMPXICommand cmd, u16 data )
 {
 	SYSMPXIPacket packet;
 	
 	OSIntrMode saved = OS_DisableInterrupts();
-	if( s_sending ) {
+	if( s_sending[cmd] )
+	{
 		OS_RestoreInterrupts( saved );
 		return FALSE;
 	}
-	s_sending      = TRUE;
+	s_sending[cmd] = TRUE;
 	OS_RestoreInterrupts( saved );
 	
-	packet.stat    = SYSM_PXI_COMM_STAT_REQ;
-	packet.command = (u16)command;
-	packet.data    = 0;
+	packet.stat = SYSM_PXI_COMM_STAT_REQ;
+	packet.cmd  = cmd;
+	packet.data = data;
 	
-	while( PXI_SendWordByFifo( SYSMENU_PXI_FIFO_TAG, packet.raw, 0 ) < 0 ) {}
+	while( PXI_SendWordByFifo( SYSMENU_PXI_FIFO_TAG, packet.raw, FALSE) != PXI_FIFO_SUCCESS )
+	{
+		SVC_WaitByLoop(1);
+	}
 	
-	while( s_sending ) {
+	return TRUE;
+}
+
+BOOL SYSMi_SendPXICommand( SYSMPXICommand cmd, u16 data )
+{
+	while( ! SYSMi_TrySendPXICommand( cmd, data ) )
+	{
 		OS_WaitAnyIrq();
 	}
+	while( s_sending[cmd] )
+	{
+		OS_WaitAnyIrq();
+	}
+	
 	return TRUE;
 }
 
@@ -70,13 +113,48 @@ void SYSMi_PXIFifoRecvCallback( PXIFifoTag tag, u32 data, BOOL err )
 {
 #pragma unused( tag, err )
 	SYSMPXIPacket packet;
+	u8 cmd;
 	packet.raw = data;
+	cmd = packet.cmd;
+
+	if( packet.stat == SYSM_PXI_COMM_STAT_ACK )
+	{
+		s_sending[cmd]  = FALSE;
+	}
+	if( packet.stat == SYSM_PXI_COMM_STAT_REQ )
+	{
+		packet.stat = SYSM_PXI_COMM_STAT_ACK;
+	}
+
+#ifdef SDK_ARM7
+
+	switch( cmd )
+	{
+		case SYSM_PXI_COMM_BL_BRIGHT:
+#ifdef PMIC_FINAL
+			MCU_WriteRegister(MCU_REG_BL_ADDR, (u8)packet.data );
+#else // PMIC_FINAL
+			PMi_SetRegister( REG_PMIC_BL_BRT_B_ADDR, (u8)packet.data );
+#endif // PMIC_FINAL
+			break;
+		default:
+#ifndef SDK_FINALROM
+            OS_Panic("illegal SYSM pxi command.");
+#else
+            OS_Panic("");
+#endif
+			break;
+	}
+
+	// PXI応答返信
+	PXI_SendWordByFifo( SYSMENU_PXI_FIFO_TAG, packet.raw, FALSE );
+
+#endif // SDK_ARM7
+
 #if 0
 	
 #ifdef SDK_ARM9
 	
-	s_sending  = FALSE;
-	
 	if( packet.stat == SYSM_PXI_COMM_STAT_ACK ) {
 		switch( data ) {
 		case SYSM_PXI_COMM_DISABLE_HOTSW:
diff --git a/build/systemMenu_RED/Launcher/ARM9/src/main.c b/build/systemMenu_RED/Launcher/ARM9/src/main.c
index 51b9668e..cf37dfc3 100644
--- a/build/systemMenu_RED/Launcher/ARM9/src/main.c
+++ b/build/systemMenu_RED/Launcher/ARM9/src/main.c
@@ -91,6 +91,7 @@ void TwlMain( void )
     SYSM_Init( Alloc, Free );                       // OS_Initの前でコールする必要あり。
     OS_Init();
     SYSM_SetArena();                                // OS_Initの後でコールする必要あり。
+    SYSM_InitPXI();                                 // OS_Initの後でコールする必要あり。
 
     // OS初期化------------------------
     OS_InitTick();
diff --git a/include/sysmenu/sysmenu_lib.h b/include/sysmenu/sysmenu_lib.h
index d0a2f675..29e08214 100644
--- a/include/sysmenu/sysmenu_lib.h
+++ b/include/sysmenu/sysmenu_lib.h
@@ -20,6 +20,7 @@
 
 #include <sysmenu/sysmenu_lib/common/sysmenu_api.h>
 #include <sysmenu/sysmenu_lib/common/sysmenu_work.h>
+#include <sysmenu/sysmenu_lib/common/pxi.h>
 
 
 #ifdef __cplusplus
diff --git a/include/sysmenu/sysmenu_lib/common/pxi.h b/include/sysmenu/sysmenu_lib/common/pxi.h
new file mode 100644
index 00000000..c02212ad
--- /dev/null
+++ b/include/sysmenu/sysmenu_lib/common/pxi.h
@@ -0,0 +1,58 @@
+/*---------------------------------------------------------------------------*
+  Project:  TwlIPL
+  File:     pxi.h
+
+  Copyright 2008 Nintendo.  All rights reserved.
+
+  These coded instructions, statements, and computer programs contain
+  proprietary information of Nintendo of America Inc. and/or Nintendo
+  Company Ltd., and are protected by Federal copyright law.  They may
+  not be disclosed to third parties or copied or duplicated in any form,
+  in whole or in part, without the prior written consent of Nintendo.
+
+  $Date:: #$
+  $Rev: $
+  $Author: $
+ *---------------------------------------------------------------------------*/
+
+#ifndef SYSM_COMMON_PXI_H_
+#define SYSM_COMMON_PXI_H_
+
+#include <nitro/pxi.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//----------------------------------------------------------------------
+//　PXIコマンド
+//----------------------------------------------------------------------
+#define SYSMENU_PXI_FIFO_TAG				PXI_FIFO_TAG_USER_1
+
+typedef enum SYSMPXICommand {
+	SYSM_PXI_COMM_BL_BRIGHT = 0,
+	SYSM_PXI_COMM_DISABLE_HOTSW = 1,
+
+	SYSM_PXI_COMM_NUM
+}SYSMPXICommand;
+
+/*---------------------------------------------------------------------------*
+    関数定義
+ *---------------------------------------------------------------------------*/
+
+// PXI初期化
+void SYSM_InitPXI( void );
+
+// PXIコマンド送信
+BOOL SYSMi_TrySendPXICommand( SYSMPXICommand cmd, u16 data );
+BOOL SYSMi_SendPXICommand( SYSMPXICommand command, u16 data );
+
+// PXIコマンド受信
+void SYSMi_PXIFifoRecvCallback( PXIFifoTag tag, u32 data, BOOL err );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // SYSM_COMMON_PXI_H_
diff --git a/include/sysmenu/sysmenu_lib/common/sysmenu_api.h b/include/sysmenu/sysmenu_lib/common/sysmenu_api.h
index 71a6e34c..bbbd31ae 100644
--- a/include/sysmenu/sysmenu_lib/common/sysmenu_api.h
+++ b/include/sysmenu/sysmenu_lib/common/sysmenu_api.h
@@ -83,6 +83,7 @@ extern void SYSM_Free( void *ptr );
 
 // 初期化
 extern void SYSM_Init( void *(*pAlloc)(u32), void (*pFree)(void*) );			// 初期化。
+extern void SYSM_InitPXI( void );												// PXI初期化
 extern void SYSM_SetArena( void );												// システムメニューのアリーナ初期化。OS_Initの後で呼んでください。
 extern void SYSM_SetAllocFunc( void *(*pAlloc)(u32), void (*pFree)(void*) );	// SYSM_initで設定した場合は必要なし。
 extern TitleProperty *SYSM_ReadParameters( void );								// 本体設定データ、リセットパラメータなどを取得
diff --git a/include/sysmenu/sysmenu_lib/common/sysmenu_work.h b/include/sysmenu/sysmenu_lib/common/sysmenu_work.h
index 65a3f7af..d1682d02 100644
--- a/include/sysmenu/sysmenu_lib/common/sysmenu_work.h
+++ b/include/sysmenu/sysmenu_lib/common/sysmenu_work.h
@@ -41,15 +41,6 @@ typedef struct TitleID_HiLo {
 }TitleID_HiLo;
 
 
-//----------------------------------------------------------------------
-//　PXIコマンド
-//----------------------------------------------------------------------
-#define SYSMENU_PXI_FIFO_TAG				PXI_FIFO_TAG_USER_0
-
-typedef enum SYSMPXICommand {
-	SYSM_PXI_COMM_DISABLE_HOTSW = 1
-}SYSMPXICommand;
-
 //----------------------------------------------------------------------
 //　ROMエミュレーション情報
 //----------------------------------------------------------------------