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_realtek.c b/sound/pci/hda/patch_realtek.c
index bc71be3..89737ae 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -2260,6 +2260,10 @@
 		info->stream[SNDRV_PCM_STREAM_PLAYBACK].nid = 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->adc_nids) {
 		p = spec->stream_analog_capture;