X60: assert audio mute before entering Suspend

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Acked-by: Sven Schnelle <svens@stackframe.org>

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6479 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/mainboard/lenovo/x60/acpi/ec.asl

@@ -35,6 +35,8 @@ Device(EC)
 				HSPA, 1,
 		Offset (0x0C),
 				LEDS, 8,	/* LED state */
+		Offset (0x3a),
+				AMUT, 1,	/* Audio Mute */
 		Offset (0x3B),
 				    , 1,
 				KBLT, 1,        /* Keyboard Light */
@@ -66,6 +68,11 @@ Device(EC)
 	{
 	}
 
+	Method (MUTE, 1, NotSerialized)
+	{
+		Store(Arg0, AMUT)
+	}
+
 	/* Sleep Button pressed */
 	Method(_Q13, 0, NotSerialized)
 	{

src/mainboard/lenovo/x60/acpi/platform.asl

@@ -67,8 +67,7 @@ Method(_PIC, 1)
 
 Method(_PTS,1)
 {
-	// Call a trap so SMI can prepare for Sleep as well.
-	// TRAP(0x55)
+	\_SB.PCI0.LPCB.EC.MUTE(1)
 }
 
 /* The _WAK method is called on system wakeup */