> mythtv@seveneves ~]$ amixer -c0 scontrols
> Simple mixer control 'PCM',0
> Simple mixer control 'PCM Capture Source',0
> Simple mixer control 'PCM',1
> Simple mixer control 'PCM',2
Maybe I should have asked for the more verbose option. It's probably
one of these.
mythtv@seveneves ~]$ amixer -c0 controls
numid=10,iface=CARD,name='Clock Source 21 Validity'
numid=15,iface=CARD,name='Clock Source 22 Validity'
numid=18,iface=CARD,name='Clock Source 23 Validity'
numid=30,iface=CARD,name='Clock Source 24 Validity'
numid=35,iface=CARD,name='Clock Source 25 Validity'
numid=16,iface=CARD,name='Headphone - Output Jack'
numid=19,iface=CARD,name='IEC958 In - Output Jack'
numid=36,iface=CARD,name='Keep Interface'
numid=24,iface=CARD,name='Line - Input Jack'
numid=20,iface=CARD,name='Mic - Input Jack'
numid=31,iface=CARD,name='Mic - Input Jack',index=1
numid=11,iface=CARD,name='Speaker - Output Jack'
numid=7,iface=MIXER,name='PCM Playback Switch'
numid=12,iface=MIXER,name='PCM Playback Switch',index=1
numid=17,iface=MIXER,name='PCM Playback Switch',index=2
numid=8,iface=MIXER,name='PCM Playback Volume'
numid=13,iface=MIXER,name='PCM Playback Volume',index=1
numid=29,iface=MIXER,name='PCM Capture Source'
numid=27,iface=MIXER,name='PCM Capture Switch'
numid=28,iface=MIXER,name='PCM Capture Volume'
numid=25,iface=MIXER,name='Line Capture Switch'
numid=26,iface=MIXER,name='Line Capture Volume'
numid=21,iface=MIXER,name='Mic Capture Switch'
numid=32,iface=MIXER,name='Mic Capture Switch',index=1
numid=22,iface=MIXER,name='Mic Capture Volume'
numid=33,iface=MIXER,name='Mic Capture Volume',index=1
numid=23,iface=MIXER,name='Auto Gain Control'
numid=34,iface=MIXER,name='Auto Gain Control',index=1
numid=9,iface=MIXER,name='Input Gain Pad Control'
numid=14,iface=MIXER,name='Input Gain Pad Control',index=1
numid=5,iface=PCM,name='Capture Channel Map'
numid=1,iface=PCM,name='Playback Channel Map'
numid=6,iface=PCM,name='Capture Channel Map',device=1
numid=2,iface=PCM,name='Playback Channel Map',device=1
numid=3,iface=PCM,name='Playback Channel Map',device=2
numid=4,iface=PCM,name='Playback Channel Map',device=3
I wanted to use "cset ... unmute", because the iec958 device seems to be muted by default sometimes, but I couldn't figure out how to specify that control. The amixer man page says:
cset <CONTROL> <PARAMETER> ...
Sets the card control contents. The identifier has these compo‐...but I couldn't figure out correct values for all these components. My attempts always got:
[mythtv@seveneves ~]$ amixer cset numid=19,iface=CARD,name='IEC958 In - Output Jack' unmute
amixer: Cannot find the given element from control default
Using -vv on the DEV=0 version does show the "meter" with the pound signs bouncing up and down, so it thinks it's sending something. But the optical cable is not lit. I did check the obvious and the stupid, and it does appear to be fully seated into the card. While I was at it, I also tried using a different optical cable that I know is good, but still no sound.