D54168.id167831.diff
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	diff --git a/sys/dev/speaker/spkr.c b/sys/dev/speaker/spkr.c
	--- a/sys/dev/speaker/spkr.c
	+++ b/sys/dev/speaker/spkr.c
	@@ -74,23 +74,29 @@
	(void) printf("tone: thz=%d centisecs=%d\n", thz, centisecs);
	#endif /* DEBUG */

	- /* set timer to generate clicks at given frequency in Hertz */
	+ /*
	+ * Acquire the i8254 clock, configure it to drive the speaker
	+ * signal, and turn on the speaker.
	+ */
	if (timer_spkr_acquire()) {
	- /* enter list of waiting procs ??? */
	return;
	}
	disable_intr();
	+ /* Configure the speaker with the tone frequency. */
	timer_spkr_setfreq(thz);
	enable_intr();

	/*
	- * Set timeout to endtone function, then give up the timeslice.
	- * This is so other processes can execute while the tone is being
	+ * Make the current thread sleep while the tone is being
	* emitted.
	*/
	timo = centisecs * hz / 100;
	if (timo > 0)
	tsleep(&endtone, SPKRPRI \| PCATCH, "spkrtn", timo);
	+
	+ /*
	+ * Turn off the speaker and release the i8254 clock.
	+ */
	timer_spkr_release();
	}