Index: acpi.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/acpica/acpi.c,v
retrieving revision 1.305.2.7
diff -u -r1.305.2.7 acpi.c
--- acpi.c	1 Jun 2012 12:47:13 -0000	1.305.2.7
+++ acpi.c	2 Jun 2012 13:08:40 -0000
@@ -55,6 +55,7 @@
 #endif
 #include <machine/resource.h>
 #include <machine/bus.h>
+#include <machine/clock.h>
 #include <sys/rman.h>
 #include <isa/isavar.h>
 #include <isa/pnpvar.h>
@@ -293,6 +294,61 @@
 SYSCTL_INT(_debug_acpi, OID_AUTO, suspend_bounce, CTLFLAG_RW,
     &acpi_susp_bounce, 0, "Don't actually suspend, just test devices.");
 
+static int acpi_sleep_beep;
+TUNABLE_INT("debug.acpi.sleep_beep", &acpi_sleep_beep);
+SYSCTL_INT(_debug_acpi, OID_AUTO, sleep_beep, CTLFLAG_RW,
+    &acpi_sleep_beep, 0, "Enable debug beep during suspend/resume.");
+
+void
+acpi_debug_beep(int reset)
+{
+#ifdef HAS_TIMER_SPKR
+
+#define DEBUG_BEEP_MELODY_DOREMI
+
+    static unsigned int	melody[] = {
+#ifdef DEBUG_BEEP_MELODY_DOREMI
+	/*	Do   Re   Mi   Fa   So   La   Ti	*/
+		262, 294, 330, 349, 392, 440, 494, 
+	/*	Do   Re   Mi   Fa   So   La   Ti	*/
+		523, 587, 659, 698, 784, 880, 988,
+#endif
+		0};
+    static unsigned int	index = 0;
+    static unsigned int	spkr_acquired = 0;
+    unsigned int	thz;
+
+    if (acpi_sleep_beep != 0) {
+	if (reset == 1) {
+	    DELAY(acpi_sleep_beep * 100000);	/* >= 100 ms */
+	    timer_spkr_release();
+	    index = 0;
+	    spkr_acquired = 0;
+	    return;
+	}
+
+	if (melody[index] == 0) {
+	    index = 0;
+	}
+
+	thz = melody[index];
+	if (thz == 0) {
+	    return;
+	}
+
+	index++;
+
+	if (spkr_acquired == 0) {
+	    timer_spkr_acquire();
+	    spkr_acquired = 1;
+	}
+
+	timer_spkr_setfreq(thz);
+	DELAY(acpi_sleep_beep * 100000);	/* >= 100 ms */
+    }
+#endif
+}
+
 /*
  * ACPI can only be loaded as a module by the loader; activating it after
  * system bootstrap time is not useful, and can be fatal to the system.
Index: acpivar.h
===================================================================
RCS file: /home/ncvs/src/sys/dev/acpica/acpivar.h,v
retrieving revision 1.125.2.4
diff -u -r1.125.2.4 acpivar.h
--- acpivar.h	23 Feb 2012 22:26:14 -0000	1.125.2.4
+++ acpivar.h	28 May 2012 23:50:29 -0000
@@ -283,6 +283,16 @@
 	return (end - start);
 }
 
+void		acpi_debug_beep(int);
+
+#define ACPI_SLEEP_DEBUG_PRINT(sc, x) do {			\
+    if (acpi_get_verbose(sc))					\
+	device_printf(sc->acpi_dev, "Executing: %s\n", x);	\
+    acpi_debug_beep(0);						\
+} while (0)
+
+#define ACPI_SLEEP_DEBUG_RESET(sc) do {acpi_debug_beep(1);} while (0)
+
 #ifdef ACPI_DEBUGGER
 void		acpi_EnterDebugger(void);
 #endif