Fixed issue where 2010 MBPs switch to Discrete Only after apps quit

Classes/GSGPU.m

@@ -64,7 +64,14 @@ static void _displayReconfigurationCallback(CGDirectDisplayID display, CGDisplay
             BOOL isUsingIntegrated = [GSMux isUsingIntegratedGPU];
 
             GTMLoggerInfo(@"Notification: GPU changed. Integrated? %d", isUsingIntegrated);
-
+
+            // For Macbook Pro 2010 users who have set the mode to Integrated Only,
+            // there will be rogue apps like Chrome that switch the graphics to
+            // Discrete Only upon closing. This will reverse the switch
+            if (!isUsingIntegrated && ([GSMux currentGSSwitcherMode]==GSSwitcherModeForceIntegrated)) {
+                [GSMux setMode:GSSwitcherModeForceIntegrated];
+            }
+
             GSGPUType activeType = (isUsingIntegrated ? GSGPUTypeIntegrated : GSGPUTypeDiscrete);
             [_delegate GPUDidChangeTo:activeType];
         });

Classes/GSMux.h

@@ -34,4 +34,7 @@ typedef enum {
 + (BOOL)isOnIntegratedOnlyMode;
 + (BOOL)isOnDiscreteOnlyMode;
 
+// Returns the value of the current GSSwitcherMode as set in the Menu
++ (GSSwitcherMode) currentGSSwitcherMode;
+
 @end

Classes/GSMux.m

@@ -239,6 +239,13 @@ static void dumpState(io_connect_t connect)
 
 @implementation GSMux
 
+static GSSwitcherMode currentGSSwitcherMode;
+
++(GSSwitcherMode)currentGSSwitcherMode
+{
+    return currentGSSwitcherMode;
+}
+
 #pragma mark - GSMux API
 #pragma mark Initialization/destruction
 
@@ -303,10 +310,14 @@ + (BOOL)setMode:(GSSwitcherMode)mode
 {
     if (_switcherConnect == IO_OBJECT_NULL)
         return NO;
-
+
+    // Set current GSSwitcher mode
+    currentGSSwitcherMode = mode;
+
     switch (mode) {
         case GSSwitcherModeForceIntegrated:
         case GSSwitcherModeForceDiscrete:
+
             // Disable dynamic switching
             setDynamicSwitchingEnabled(_switcherConnect, NO);