diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 80d6add8a620e23fba3c7790b949eeb202d1a8b8..9693059dec84326b00d0366e0851459b82c85ce3 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3329,6 +3329,12 @@ static void alc_auto_set_output_and_unmute(struct hda_codec *codec,
 	if (nid)
 		snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_AMP_GAIN_MUTE,
 				    AMP_OUT_ZERO);
+
+	/* unmute DAC if it's not assigned to a mixer */
+	nid = alc_look_for_out_mute_nid(codec, pin, dac);
+	if (nid == mix && nid_has_mute(codec, dac, HDA_OUTPUT))
+		snd_hda_codec_write(codec, dac, 0, AC_VERB_SET_AMP_GAIN_MUTE,
+				    AMP_OUT_ZERO);
 }
 
 static void alc_auto_init_multi_out(struct hda_codec *codec)