[ALSA] hda: Fix 5.1 sound in Dell 6stack ALC888 HDA

This patch fixes 5.1 surround output and headphone detection in the
Dell Inspiron 530 and possibly other Dell systems using the ALC888
codec (mode 6stack-dell).

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 959c80d..9f40935e 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -872,6 +872,7 @@
 	  haier-w66	Haier W66
 	  6stack-hp	HP machines with 6stack (Nettle boards)
 	  3stack-hp	HP machines with 3stack (Lucknow, Samba boards)
+	  6stack-dell	Dell machines with 6stack (Inspiron 530)
 	  mitac		Mitac 8252D
 	  auto		auto-config reading BIOS (default)