[alsa-devel] Smart 5.1 function not working on VIA VT1708S with *three* jacks on mainboard

[Clemens Ladisch]

Viliam Kubis wrote:
> Hello, for quite some time the "Smart 5.1" function in alsa is not working
> properly when motherboard has only 3 audio jacks.
> 
> speaker-test -c 4 -t wav -Dsurround40
> 
> Channels count (4) not available for playbacks: Invalid argument

Please try the patch below.

(This function uses 0x12 and 0x13 as the NIDs for the center/LFE and
side DACs.  Shouldn't these be 0x24 and 0x25, as per the datasheet?)

--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -2265,6 +2265,13 @@ static int vt1708_auto_fill_dac_nids(str
 		}
 	}
 
+	/* for Smart 5.1, line/mic inputs double as output pins */
+	if (cfg->line_outs == 1) {
+		spec->multiout.num_dacs = 3;
+		spec->multiout.dac_nids[AUTO_SEQ_SURROUND] = 0x11;
+		spec->multiout.dac_nids[AUTO_SEQ_CENLFE] = 0x12;
+	}
+
 	return 0;
 }