From https://sourceforge.net/tracker/?func=detail&aid=3152167&group_id=167869&atid=844658

diff -aNru trunk/g15daemon-wip/plugins/g15_plugin_uinput.c mod/g15daemon-wip/plugins/g15_plugin_uinput.c
--- trunk/g15daemon-wip/plugins/g15_plugin_uinput.c	2011-06-26 06:50:50.000000000 +0000
+++ mod/g15daemon-wip/plugins/g15_plugin_uinput.c	2011-06-26 06:51:42.000000000 +0000
@@ -164,146 +164,195 @@
     
 static void g15_process_keys(g15daemon_t *masterlist, unsigned int currentkeys, unsigned int lastkeys)
 {
-    /* 'G' keys */
-    if((currentkeys & G15_KEY_G1) && !(lastkeys & G15_KEY_G1))
-        keydown(GKEY_OFFSET);
-    else if(!(currentkeys & G15_KEY_G1) && (lastkeys & G15_KEY_G1))
-        keyup(GKEY_OFFSET);
-
-    if((currentkeys & G15_KEY_G2) && !(lastkeys & G15_KEY_G2))
-        keydown(GKEY_OFFSET+1);
-    else if(!(currentkeys & G15_KEY_G2) && (lastkeys & G15_KEY_G2))
-        keyup(GKEY_OFFSET+1);
-
-    if((currentkeys & G15_KEY_G3) && !(lastkeys & G15_KEY_G3))
-        keydown(GKEY_OFFSET+2);
-    else if(!(currentkeys & G15_KEY_G3) && (lastkeys & G15_KEY_G3))
-        keyup(GKEY_OFFSET+2);
-
-    if((currentkeys & G15_KEY_G4) && !(lastkeys & G15_KEY_G4))
-        keydown(GKEY_OFFSET+3);
-    else if(!(currentkeys & G15_KEY_G4) && (lastkeys & G15_KEY_G4))
-        keyup(GKEY_OFFSET+3);
-
-    if((currentkeys & G15_KEY_G5) && !(lastkeys & G15_KEY_G5))
-        keydown(GKEY_OFFSET+4);
-    else if(!(currentkeys & G15_KEY_G5) && (lastkeys & G15_KEY_G5))
-        keyup(GKEY_OFFSET+4);
-
-    if((currentkeys & G15_KEY_G6) && !(lastkeys & G15_KEY_G6))
-        keydown(GKEY_OFFSET+5);
-    else if(!(currentkeys & G15_KEY_G6) && (lastkeys & G15_KEY_G6))
-        keyup(GKEY_OFFSET+5);
-
-    if((currentkeys & G15_KEY_G7) && !(lastkeys & G15_KEY_G7))
-        keydown(GKEY_OFFSET+6);
-    else if(!(currentkeys & G15_KEY_G7) && (lastkeys & G15_KEY_G7))
-        keyup(GKEY_OFFSET+6);
-
-    if((currentkeys & G15_KEY_G8) && !(lastkeys & G15_KEY_G8))
-        keydown(GKEY_OFFSET+7);
-    else if(!(currentkeys & G15_KEY_G8) && (lastkeys & G15_KEY_G8))
-        keyup(GKEY_OFFSET+7);
-
-    if((currentkeys & G15_KEY_G9) && !(lastkeys & G15_KEY_G9))
-        keydown(GKEY_OFFSET+8);
-    else if(!(currentkeys & G15_KEY_G9) && (lastkeys & G15_KEY_G9))
-        keyup(GKEY_OFFSET+8);
-
-    if((currentkeys & G15_KEY_G10) && !(lastkeys & G15_KEY_G10))
-        keydown(GKEY_OFFSET+9);
-    else if(!(currentkeys & G15_KEY_G10) && (lastkeys & G15_KEY_G10))
-        keyup(GKEY_OFFSET+9);
-
-    if((currentkeys & G15_KEY_G11) && !(lastkeys & G15_KEY_G11))
-        keydown(GKEY_OFFSET+10);
-    else if(!(currentkeys & G15_KEY_G11) && (lastkeys & G15_KEY_G11))
-        keyup(GKEY_OFFSET+10);
-
-    if((currentkeys & G15_KEY_G12) && !(lastkeys & G15_KEY_G12))
-        keydown(GKEY_OFFSET+11);
-    else if(!(currentkeys & G15_KEY_G12) && (lastkeys & G15_KEY_G12))
-        keyup(GKEY_OFFSET+11);
-
-    if((currentkeys & G15_KEY_G13) && !(lastkeys & G15_KEY_G13))
-        keydown(GKEY_OFFSET+12);
-    else if(!(currentkeys & G15_KEY_G13) && (lastkeys & G15_KEY_G13))
-        keyup(GKEY_OFFSET+12);
-
-    if((currentkeys & G15_KEY_G14) && !(lastkeys & G15_KEY_G14))
-        keydown(GKEY_OFFSET+13);
-    else if(!(currentkeys & G15_KEY_G14) && (lastkeys & G15_KEY_G14))
-        keyup(GKEY_OFFSET+13);
-
-    if((currentkeys & G15_KEY_G15) && !(lastkeys & G15_KEY_G15))
-        keydown(GKEY_OFFSET+14);
-    else if(!(currentkeys & G15_KEY_G15) && (lastkeys & G15_KEY_G15))
-        keyup(GKEY_OFFSET+14);
-
-    if((currentkeys & G15_KEY_G16) && !(lastkeys & G15_KEY_G16))
-        keydown(GKEY_OFFSET+15);
-    else if(!(currentkeys & G15_KEY_G16) && (lastkeys & G15_KEY_G16))
-        keyup(GKEY_OFFSET+15);
-
-    if((currentkeys & G15_KEY_G17) && !(lastkeys & G15_KEY_G17))
-        keydown(GKEY_OFFSET+16);
-    else if(!(currentkeys & G15_KEY_G17) && (lastkeys & G15_KEY_G17))
-        keyup(GKEY_OFFSET+16);
-
-    if((currentkeys & G15_KEY_G18) && !(lastkeys & G15_KEY_G18))
-        keydown(GKEY_OFFSET+17);
-    else if(!(currentkeys & G15_KEY_G18) && (lastkeys & G15_KEY_G18))
-        keyup(GKEY_OFFSET+17);
-
-    /* 'M' keys */
-
-    if((currentkeys & G15_KEY_M1) && !(lastkeys & G15_KEY_M1))
-        keydown(MKEY_OFFSET);
-    else if(!(currentkeys & G15_KEY_M1) && (lastkeys & G15_KEY_M1))
-        keyup(MKEY_OFFSET);
-
-    if((currentkeys & G15_KEY_M2) && !(lastkeys & G15_KEY_M2))
-        keydown(MKEY_OFFSET+1);
-    else if(!(currentkeys & G15_KEY_M2) && (lastkeys & G15_KEY_M2))
-        keyup(MKEY_OFFSET+1);
-
-    if((currentkeys & G15_KEY_M3) && !(lastkeys & G15_KEY_M3))
-        keydown(MKEY_OFFSET+2);
-    else if(!(currentkeys & G15_KEY_M3) && (lastkeys & G15_KEY_M3))
-        keyup(MKEY_OFFSET+2);
-
-    if((currentkeys & G15_KEY_MR) && !(lastkeys & G15_KEY_MR))
-        keydown(MKEY_OFFSET+3);
-    else if(!(currentkeys & G15_KEY_MR) && (lastkeys & G15_KEY_MR))
-        keyup(MKEY_OFFSET+3);
-    
-    if(map_Lkeys){
-        /* 'L' keys...  */
-        if((currentkeys & G15_KEY_L1) && !(lastkeys & G15_KEY_L1))
-            keydown(LKEY_OFFSET);
-        else if(!(currentkeys & G15_KEY_L1) && (lastkeys & G15_KEY_L1))
-            keyup(LKEY_OFFSET);
-
-        if((currentkeys & G15_KEY_L2) && !(lastkeys & G15_KEY_L2))
-            keydown(LKEY_OFFSET+1);
-        else if(!(currentkeys & G15_KEY_L2) && (lastkeys & G15_KEY_L2))
-            keyup(LKEY_OFFSET+1);
-
-        if((currentkeys & G15_KEY_L3) && !(lastkeys & G15_KEY_L3))
-            keydown(LKEY_OFFSET+2);
-        else if(!(currentkeys & G15_KEY_L3) && (lastkeys & G15_KEY_L3))
-            keyup(LKEY_OFFSET+2);
-
-        if((currentkeys & G15_KEY_L4) && !(lastkeys & G15_KEY_L4))
-            keydown(LKEY_OFFSET+3);
-        else if(!(currentkeys & G15_KEY_L4) && (lastkeys & G15_KEY_L4))
-            keyup(LKEY_OFFSET+3);
-
-        if((currentkeys & G15_KEY_L5) && !(lastkeys & G15_KEY_L5))
-            keydown(LKEY_OFFSET+4);
-        else if(!(currentkeys & G15_KEY_L5) && (lastkeys & G15_KEY_L5))
-            keyup(LKEY_OFFSET+4);
+    if(!(currentkeys & G15_KEY_LIGHT))
+	 {
+        /* 'G' keys */
+        if((currentkeys & G15_KEY_G1) && !(lastkeys & G15_KEY_G1))
+            keydown(GKEY_OFFSET);
+        else if(!(currentkeys & G15_KEY_G1) && (lastkeys & G15_KEY_G1))
+            keyup(GKEY_OFFSET);
+    
+        if((currentkeys & G15_KEY_G2) && !(lastkeys & G15_KEY_G2))
+            keydown(GKEY_OFFSET+1);
+        else if(!(currentkeys & G15_KEY_G2) && (lastkeys & G15_KEY_G2))
+            keyup(GKEY_OFFSET+1);
+    
+        if((currentkeys & G15_KEY_G3) && !(lastkeys & G15_KEY_G3))
+            keydown(GKEY_OFFSET+2);
+        else if(!(currentkeys & G15_KEY_G3) && (lastkeys & G15_KEY_G3))
+            keyup(GKEY_OFFSET+2);
+    
+        if((currentkeys & G15_KEY_G4) && !(lastkeys & G15_KEY_G4))
+            keydown(GKEY_OFFSET+3);
+        else if(!(currentkeys & G15_KEY_G4) && (lastkeys & G15_KEY_G4))
+            keyup(GKEY_OFFSET+3);
+    
+        if((currentkeys & G15_KEY_G5) && !(lastkeys & G15_KEY_G5))
+            keydown(GKEY_OFFSET+4);
+        else if(!(currentkeys & G15_KEY_G5) && (lastkeys & G15_KEY_G5))
+            keyup(GKEY_OFFSET+4);
+    
+        if((currentkeys & G15_KEY_G6) && !(lastkeys & G15_KEY_G6))
+            keydown(GKEY_OFFSET+5);
+        else if(!(currentkeys & G15_KEY_G6) && (lastkeys & G15_KEY_G6))
+            keyup(GKEY_OFFSET+5);
+    
+        if((currentkeys & G15_KEY_G7) && !(lastkeys & G15_KEY_G7))
+            keydown(GKEY_OFFSET+6);
+        else if(!(currentkeys & G15_KEY_G7) && (lastkeys & G15_KEY_G7))
+            keyup(GKEY_OFFSET+6);
+    
+        if((currentkeys & G15_KEY_G8) && !(lastkeys & G15_KEY_G8))
+            keydown(GKEY_OFFSET+7);
+        else if(!(currentkeys & G15_KEY_G8) && (lastkeys & G15_KEY_G8))
+            keyup(GKEY_OFFSET+7);
+    
+        if((currentkeys & G15_KEY_G9) && !(lastkeys & G15_KEY_G9))
+            keydown(GKEY_OFFSET+8);
+        else if(!(currentkeys & G15_KEY_G9) && (lastkeys & G15_KEY_G9))
+            keyup(GKEY_OFFSET+8);
+    
+        if((currentkeys & G15_KEY_G10) && !(lastkeys & G15_KEY_G10))
+            keydown(GKEY_OFFSET+9);
+        else if(!(currentkeys & G15_KEY_G10) && (lastkeys & G15_KEY_G10))
+            keyup(GKEY_OFFSET+9);
+    
+        if((currentkeys & G15_KEY_G11) && !(lastkeys & G15_KEY_G11))
+            keydown(GKEY_OFFSET+10);
+        else if(!(currentkeys & G15_KEY_G11) && (lastkeys & G15_KEY_G11))
+            keyup(GKEY_OFFSET+10);
+    
+        if((currentkeys & G15_KEY_G12) && !(lastkeys & G15_KEY_G12))
+            keydown(GKEY_OFFSET+11);
+        else if(!(currentkeys & G15_KEY_G12) && (lastkeys & G15_KEY_G12))
+            keyup(GKEY_OFFSET+11);
+    
+        if((currentkeys & G15_KEY_G13) && !(lastkeys & G15_KEY_G13))
+            keydown(GKEY_OFFSET+12);
+        else if(!(currentkeys & G15_KEY_G13) && (lastkeys & G15_KEY_G13))
+            keyup(GKEY_OFFSET+12);
+    
+        if((currentkeys & G15_KEY_G14) && !(lastkeys & G15_KEY_G14))
+            keydown(GKEY_OFFSET+13);
+        else if(!(currentkeys & G15_KEY_G14) && (lastkeys & G15_KEY_G14))
+            keyup(GKEY_OFFSET+13);
+    
+        if((currentkeys & G15_KEY_G15) && !(lastkeys & G15_KEY_G15))
+            keydown(GKEY_OFFSET+14);
+        else if(!(currentkeys & G15_KEY_G15) && (lastkeys & G15_KEY_G15))
+            keyup(GKEY_OFFSET+14);
+    
+        if((currentkeys & G15_KEY_G16) && !(lastkeys & G15_KEY_G16))
+            keydown(GKEY_OFFSET+15);
+        else if(!(currentkeys & G15_KEY_G16) && (lastkeys & G15_KEY_G16))
+            keyup(GKEY_OFFSET+15);
+    
+        if((currentkeys & G15_KEY_G17) && !(lastkeys & G15_KEY_G17))
+            keydown(GKEY_OFFSET+16);
+        else if(!(currentkeys & G15_KEY_G17) && (lastkeys & G15_KEY_G17))
+            keyup(GKEY_OFFSET+16);
+    
+        if((currentkeys & G15_KEY_G18) && !(lastkeys & G15_KEY_G18))
+            keydown(GKEY_OFFSET+17);
+        else if(!(currentkeys & G15_KEY_G18) && (lastkeys & G15_KEY_G18))
+            keyup(GKEY_OFFSET+17);
+    
+        /* 'M' keys */
+    
+        if((currentkeys & G15_KEY_M1) && !(lastkeys & G15_KEY_M1))
+            keydown(MKEY_OFFSET);
+        else if(!(currentkeys & G15_KEY_M1) && (lastkeys & G15_KEY_M1))
+            keyup(MKEY_OFFSET);
+    
+        if((currentkeys & G15_KEY_M2) && !(lastkeys & G15_KEY_M2))
+            keydown(MKEY_OFFSET+1);
+        else if(!(currentkeys & G15_KEY_M2) && (lastkeys & G15_KEY_M2))
+            keyup(MKEY_OFFSET+1);
+    
+        if((currentkeys & G15_KEY_M3) && !(lastkeys & G15_KEY_M3))
+            keydown(MKEY_OFFSET+2);
+        else if(!(currentkeys & G15_KEY_M3) && (lastkeys & G15_KEY_M3))
+            keyup(MKEY_OFFSET+2);
+    
+        if((currentkeys & G15_KEY_MR) && !(lastkeys & G15_KEY_MR))
+            keydown(MKEY_OFFSET+3);
+        else if(!(currentkeys & G15_KEY_MR) && (lastkeys & G15_KEY_MR))
+            keyup(MKEY_OFFSET+3);
+        
+        if(map_Lkeys){
+            /* 'L' keys...  */
+            if((currentkeys & G15_KEY_L1) && !(lastkeys & G15_KEY_L1))
+                keydown(LKEY_OFFSET);
+            else if(!(currentkeys & G15_KEY_L1) && (lastkeys & G15_KEY_L1))
+                keyup(LKEY_OFFSET);
+    
+            if((currentkeys & G15_KEY_L2) && !(lastkeys & G15_KEY_L2))
+                keydown(LKEY_OFFSET+1);
+            else if(!(currentkeys & G15_KEY_L2) && (lastkeys & G15_KEY_L2))
+                keyup(LKEY_OFFSET+1);
+    
+            if((currentkeys & G15_KEY_L3) && !(lastkeys & G15_KEY_L3))
+                keydown(LKEY_OFFSET+2);
+            else if(!(currentkeys & G15_KEY_L3) && (lastkeys & G15_KEY_L3))
+                keyup(LKEY_OFFSET+2);
+    
+            if((currentkeys & G15_KEY_L4) && !(lastkeys & G15_KEY_L4))
+                keydown(LKEY_OFFSET+3);
+            else if(!(currentkeys & G15_KEY_L4) && (lastkeys & G15_KEY_L4))
+                keyup(LKEY_OFFSET+3);
+    
+            if((currentkeys & G15_KEY_L5) && !(lastkeys & G15_KEY_L5))
+                keydown(LKEY_OFFSET+4);
+            else if(!(currentkeys & G15_KEY_L5) && (lastkeys & G15_KEY_L5))
+                keyup(LKEY_OFFSET+4);
+        }
     }
+	 else
+	 {
+        // G15_KEY_LIGHT - Key modifier for Logitech G510 Media Keys implementation
+
+        // XF86AudioPlay
+        if((currentkeys & G15_KEY_G1) && !(lastkeys & G15_KEY_G1))
+            keydown(KEY_PLAYPAUSE);
+        else if(!(currentkeys & G15_KEY_G1) && (lastkeys & G15_KEY_G1))
+            keyup(KEY_PLAYPAUSE);
+
+        // XF86AudioStop
+        if((currentkeys & G15_KEY_G2) && !(lastkeys & G15_KEY_G2))
+            keydown(KEY_STOPCD);
+        else if(!(currentkeys & G15_KEY_G2) && (lastkeys & G15_KEY_G2))
+            keyup(KEY_STOPCD);
+
+        // XF86AudioPrev
+        if((currentkeys & G15_KEY_G3) && !(lastkeys & G15_KEY_G3))
+            keydown(KEY_PREVIOUSSONG);
+        else if(!(currentkeys & G15_KEY_G3) && (lastkeys & G15_KEY_G3))
+            keyup(KEY_PREVIOUSSONG);
+
+        // XF86AudioNext
+        if((currentkeys & G15_KEY_G4) && !(lastkeys & G15_KEY_G4))
+            keydown(KEY_NEXTSONG);
+        else if(!(currentkeys & G15_KEY_G4) && (lastkeys & G15_KEY_G4))
+            keyup(KEY_NEXTSONG);
+
+        // XF86AudioMute
+        if((currentkeys & G15_KEY_G5) && !(lastkeys & G15_KEY_G5))
+            keydown(KEY_MUTE);
+        else if(!(currentkeys & G15_KEY_G5) && (lastkeys & G15_KEY_G5))
+            keyup(KEY_MUTE);
+
+        // XF86AudioRaiseVolume
+        if((currentkeys & G15_KEY_G6) && !(lastkeys & G15_KEY_G6))
+            keydown(KEY_VOLUMEUP);
+        else if(!(currentkeys & G15_KEY_G6) && (lastkeys & G15_KEY_G6))
+            keyup(KEY_VOLUMEUP);
+
+        // XF86AudioLowerVolume
+        if((currentkeys & G15_KEY_G7) && !(lastkeys & G15_KEY_G7))
+            keydown(KEY_VOLUMEDOWN);
+        else if(!(currentkeys & G15_KEY_G7) && (lastkeys & G15_KEY_G7))
+            keyup(KEY_VOLUMEDOWN);
+	 }
 }