diff --git a/config/os/generic/sanitycheck.c b/config/os/generic/sanitycheck.c
index d188729..45f9331 100644
--- a/config/os/generic/sanitycheck.c
+++ b/config/os/generic/sanitycheck.c
@@ -1,7 +1,7 @@
 #include <jack/sanitycheck.c>
 
 int
-sanitycheck ()
+sanitycheck (int a, int b)
 {
 	return 0;
 }
diff --git a/config/os/gnu-linux/sanitycheck.c b/config/os/gnu-linux/sanitycheck.c
index 8631f60..c29f541 100644
--- a/config/os/gnu-linux/sanitycheck.c
+++ b/config/os/gnu-linux/sanitycheck.c
@@ -11,13 +11,14 @@
 #include <jack/systemtest.h>
 #include <jack/sanitycheck.h>
 
-int sanitycheck() 
+int sanitycheck (int care_about_realtime, 
+		 int care_about_freqscaling) 
 {
   int errors = 0;
   int warnings = 0;
   int relogin = 0;
 
-  if (!system_user_can_rtprio()) {
+  if (care_about_realtime && !system_user_can_rtprio()) {
 	  errors++;
 	  relogin++;
 	  fprintf(stderr, "\nYou are not allowed to set realtime priority.\n");
@@ -43,13 +44,13 @@ int sanitycheck()
 		  fprintf(stderr, "  usermod -a -G audio %s\n", system_get_username());
 	  }
   }
-  if (system_has_frequencyscaling() && system_uses_frequencyscaling()) {
+  if (care_about_freqscaling && system_has_frequencyscaling() && system_uses_frequencyscaling()) {
 	  warnings++;
 	  fprintf(stderr, "\n--------------------------------------------------------------------------------\n");
 	  fprintf(stderr, "WARNING: Your system seems to use frequency scaling.\n\n");
 	  fprintf(stderr, "   This can have a serious impact on audio latency. You have two choices:\n");
 	  fprintf(stderr, "\t(1)turn it off, e.g. by chosing the 'performance' governor.\n");
-	  fprintf(stderr, "\t(2)Use the HPET clocksource by passing \"-h h\" to JACK\n");
+	  fprintf(stderr, "\t(2)Use the HPET clocksource by passing \"-c h\" to JACK\n");
 	  fprintf(stderr, "\t   (this second option only works on relatively recent computers)\n");
 	  fprintf(stderr, "--------------------------------------------------------------------------------\n\n");
   }
diff --git a/config/os/macosx/sanitycheck.c b/config/os/macosx/sanitycheck.c
index d188729..45f9331 100644
--- a/config/os/macosx/sanitycheck.c
+++ b/config/os/macosx/sanitycheck.c
@@ -1,7 +1,7 @@
 #include <jack/sanitycheck.c>
 
 int
-sanitycheck ()
+sanitycheck (int a, int b)
 {
 	return 0;
 }
diff --git a/jack/sanitycheck.h b/jack/sanitycheck.h
index ecf3738..5c98896 100644
--- a/jack/sanitycheck.h
+++ b/jack/sanitycheck.h
@@ -16,6 +16,7 @@
  *
  **/
 
-int sanitycheck();
+int sanitycheck (int do_realtime_check,
+		 int do_freqscaling_check);
 
 #endif /* __jack_sanitycheck_h__ */
diff --git a/jackd/jackd.c b/jackd/jackd.c
index e7fe570..ffc6ded 100644
--- a/jackd/jackd.c
+++ b/jackd/jackd.c
@@ -56,7 +56,7 @@ static JSList *drivers = NULL;
 static sigset_t signals;
 static jack_engine_t *engine = NULL;
 static char *server_name = NULL;
-static int realtime = 0;
+static int realtime = 1;
 static int realtime_priority = 10;
 static int do_mlock = 1;
 static int temporary = 0;
@@ -510,26 +510,29 @@ main (int argc, char *argv[])
 
 {
 	jack_driver_desc_t * desc;
-	const char *options = "-ad:P:uvshVRZTFlt:mn:Np:c:";
+	const char *options = "-ad:P:uvshVRLZTFlt:mn:Np:c:";
 	struct option long_options[] = 
 	{ 
+		/* keep ordered by single-letter option code */
+
+		{ "clock-source", 1, 0, 'c' },
 		{ "driver", 1, 0, 'd' },
-		{ "verbose", 0, 0, 'v' },
 		{ "help", 0, 0, 'h' },
 		{ "tmpdir-location", 0, 0, 'l' },
-		{ "port-max", 1, 0, 'p' },
+		{ "no-realtime", 0, 0, 'L' },
 		{ "no-mlock", 0, 0, 'm' },
 		{ "name", 1, 0, 'n' },
                 { "no-sanity-checks", 0, 0, 'N' },
-		{ "unlock", 0, 0, 'u' },
+		{ "port-max", 1, 0, 'p' },
+		{ "realtime-priority", 1, 0, 'P' },
 		{ "realtime", 0, 0, 'R' },
 		{ "replace-registry", 0, 0, 'r' },
-		{ "realtime-priority", 1, 0, 'P' },
+		{ "silent", 0, 0, 's' },
 		{ "timeout", 1, 0, 't' },
 		{ "temporary", 0, 0, 'T' },
+		{ "unlock", 0, 0, 'u' },
 		{ "version", 0, 0, 'V' },
-		{ "silent", 0, 0, 's' },
-		{ "clock-source", 1, 0, 'c' },
+		{ "verbose", 0, 0, 'v' },
 		{ "nozombies", 0, 0, 'Z' },
 		{ 0, 0, 0, 0 }
 	};
@@ -583,6 +586,10 @@ main (int argc, char *argv[])
 			printf ("%s\n", jack_tmpdir);
 			exit (0);
 
+		case 'L':
+			realtime = 0;
+			break;
+
 		case 'm':
 			do_mlock = 0;
 			break;
@@ -608,6 +615,7 @@ main (int argc, char *argv[])
 			break;
 
 		case 'R':
+			/* this is now the default */
 			realtime = 1;
 			break;
 
@@ -649,7 +657,7 @@ main (int argc, char *argv[])
 		}
 	}
 
-	if (do_sanity_checks && (0 < sanitycheck())) {
+	if (do_sanity_checks && (0 < sanitycheck (realtime, (clock_source = JACK_TIMER_CYCLE_COUNTER)))) {
 		return -1;
 	}