=== modified file 'sdl.c'
--- sdl.c	2010-02-26 16:26:00 +0000
+++ sdl.c	2010-11-18 22:47:20 +0000
@@ -390,10 +390,13 @@
         break;
     case 0x45: /* num lock */
     case 0x3a: /* caps lock */
-        /* SDL does not send the key up event, so we generate it */
-        kbd_put_keycode(keycode);
-        kbd_put_keycode(keycode | 0x80);
-        return;
+        /* SDL does not send the key up event for real caps lock, so we generate it */
+        if (ev->keysym.sym == 0x12d) {
+            kbd_put_keycode(keycode);
+            kbd_put_keycode(keycode | 0x80);
+            return;
+        }
+        break;
     }
 
     /* now send the key code */