=== modified file 'grub-core/commands/sleep.c'
--- grub-core/commands/sleep.c	2013-07-11 14:02:22 +0000
+++ grub-core/commands/sleep.c	2013-09-16 05:53:09 +0000
@@ -30,7 +30,7 @@
 static const struct grub_arg_option options[] =
   {
     {"verbose", 'v', 0, N_("Verbose countdown."), 0, 0},
-    {"interruptible", 'i', 0, N_("Allow to interrupt with ESC."), 0, 0},
+    {"interruptible", 'i', 0, N_("Allow to interrupt with one key."), 0, ARG_TYPE_STRING},
     {0, 0, 0, 0, 0, 0}
   };
 
@@ -46,16 +46,62 @@
   grub_refresh ();
 }
 
+static int
+grub_get_keycode_from_str (char *arg)
+{
+  
+  int n = grub_strlen (arg);
+
+  /* User gives a char */
+  if (n == 1)
+    return arg[0];
+  
+  /* check for special keys. */
+  if (grub_strcmp (arg, "tab") == 0)
+    return GRUB_TERM_TAB;
+  if (grub_strcmp (arg, "backspace") == 0)
+    return GRUB_TERM_BACKSPACE;
+  if (grub_strcmp (arg, "esc") == 0)
+    return GRUB_TERM_ESC;
+  if (grub_strcmp (arg, "f1") == 0)
+    return GRUB_TERM_KEY_F1;
+  if (grub_strcmp (arg, "f2") == 0)
+    return GRUB_TERM_KEY_F2;
+  if (grub_strcmp (arg, "f3") == 0)
+    return GRUB_TERM_KEY_F3;
+  if (grub_strcmp (arg, "f4") == 0)
+    return GRUB_TERM_KEY_F4;
+  if (grub_strcmp (arg, "f5") == 0)
+    return GRUB_TERM_KEY_F5;
+  if (grub_strcmp (arg, "f6") == 0)
+    return GRUB_TERM_KEY_F6;
+  if (grub_strcmp (arg, "f7") == 0)
+    return GRUB_TERM_KEY_F7;
+  if (grub_strcmp (arg, "f8") == 0)
+    return GRUB_TERM_KEY_F8;
+  if (grub_strcmp (arg, "f9") == 0)
+    return GRUB_TERM_KEY_F9;
+  if (grub_strcmp (arg, "f10") == 0)
+    return GRUB_TERM_KEY_F10;
+  if (grub_strcmp (arg, "f11") == 0)
+    return GRUB_TERM_KEY_F11;
+  if (grub_strcmp (arg, "f12") == 0)
+    return GRUB_TERM_KEY_F12;
+
+  /* fallback to ESC */
+  return GRUB_TERM_ESC;
+}
+
 /* Based on grub_millisleep() from kern/generic/millisleep.c.  */
 static int
-grub_interruptible_millisleep (grub_uint32_t ms)
+grub_interruptible_millisleep (grub_uint32_t ms, int key)
 {
   grub_uint64_t start;
 
   start = grub_get_time_ms ();
 
   while (grub_get_time_ms () - start < ms)
-    if (grub_getkey_noblock () == GRUB_TERM_ESC)
+    if (grub_getkey_noblock () == key)
       return 1;
 
   return 0;
@@ -65,7 +111,7 @@
 grub_cmd_sleep (grub_extcmd_context_t ctxt, int argc, char **args)
 {
   struct grub_arg_list *state = ctxt->state;
-  int n;
+  int n, key;
 
   if (argc != 1)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
@@ -82,6 +128,9 @@
 
   pos = grub_term_save_pos ();
 
+  if (state[1].set)
+    key = grub_get_keycode_from_str (state[1].arg);
+
   for (; n; n--)
     {
       if (state[0].set)
@@ -89,7 +138,7 @@
 
       if (state[1].set)
 	{
-	  if (grub_interruptible_millisleep (1000))
+	  if (grub_interruptible_millisleep (1000, key))
 	    return 1;
 	}
       else