diff -ur /home/nemesis/src/linux/aureal/alsa/alsa-driver-0.9.4/sound/pci/ac97/ac97_codec.c sound/pci/ac97/ac97_codec.c
--- /home/nemesis/src/linux/aureal/alsa/alsa-driver-0.9.4/sound/pci/ac97/ac97_codec.c	2003-05-31 09:15:01.000000000 -0500
+++ sound/pci/ac97/ac97_codec.c	2003-06-15 06:42:33.000000000 -0500
@@ -743,6 +743,12 @@
 AC97_DOUBLE("Sigmatel Surround Playback Volume", AC97_HEADPHONE, 8, 0, 31, 1)
 };
 
+static const snd_kcontrol_new_t snd_ac97_sigmatel_4speaker =
+AC97_SINGLE("Sigmatel 4-Speaker Stereo Playback Switch", AC97_SIGMATEL_DAC2INVERT, 2, 1, 0);
+
+static const snd_kcontrol_new_t snd_ac97_sigmatel_phaseinvert =
+AC97_SINGLE("Sigmatel Surround Phase Inversion Playback Switch", AC97_SIGMATEL_DAC2INVERT, 3, 1, 0);
+
 static const snd_kcontrol_new_t snd_ac97_sigmatel_controls[] = {
 AC97_SINGLE("Sigmatel DAC 6dB Attenuate", AC97_SIGMATEL_ANALOG, 1, 1, 0),
 AC97_SINGLE("Sigmatel ADC 6dB Attenuate", AC97_SIGMATEL_ANALOG, 0, 1, 0)
@@ -1872,6 +1878,12 @@
 		if (snd_ac97_try_bit(ac97, AC97_SIGMATEL_ANALOG, 0))
 			if ((err = snd_ctl_add(card, snd_ac97_cnew(&snd_ac97_sigmatel_controls[1], ac97))) < 0)
 				return err;
+		if (snd_ac97_try_bit(ac97, AC97_SIGMATEL_DAC2INVERT, 2))
+			if ((err = snd_ctl_add(card, snd_ac97_cnew(&snd_ac97_sigmatel_4speaker, ac97))) < 0)
+				return err;
+		if (snd_ac97_try_bit(ac97, AC97_SIGMATEL_DAC2INVERT, 3))
+			if ((err = snd_ctl_add(card, snd_ac97_cnew(&snd_ac97_sigmatel_phaseinvert, ac97))) < 0)
+				return err;
 		break;
 	case AC97_ID_ALC650:
 		/* detect ALC650 rev.E of later */