[ALSA] hda-intel - Show more volume-knob attributes

Show more attributs of volume-knob widgets.
Also don't put empty lines when no connection list is found.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 2bce925..0331510 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -135,6 +135,7 @@
 #define AC_PAR_PROC_CAP			0x10
 #define AC_PAR_GPIO_CAP			0x11
 #define AC_PAR_AMP_OUT_CAP		0x12
+#define AC_PAR_VOL_KNB_CAP		0x13
 
 /*
  * AC_VERB_PARAMETERS results (32bit)