ALSA: hda - Apply a proper chmap for built-in 2.1 speakers

When 2.1 speakers are detected, use the corresponding channel map
instead of the standard map with front+rear surrounds.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index 0e9b074..9ae8cfc 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -1555,6 +1555,10 @@
 				spec->multiout.dac_nids[0];
 			info->stream[SNDRV_PCM_STREAM_PLAYBACK].channels_max =
 				spec->multiout.max_channels;
+			if (spec->autocfg.line_out_type == AUTO_PIN_SPEAKER_OUT
+			    && spec->autocfg.line_outs == 2)
+				info->stream[SNDRV_PCM_STREAM_PLAYBACK].chmap =
+					snd_pcm_2_1_chmaps;
 		}
 
 		if (!spec->stream_analog_capture) {