On 7/27/20 8:13 AM, Greg Woods wrote:
mythtv@seveneves ~]$ amixer -c0 controls
numid=19,iface=CARD,name='IEC958 In - Output Jack'

That's promising.  Try:
amixer -c0 sset 'IEC958 In - Output Jack' on
Now that you've enabled the onboard sound card, it might have changed the numbering, so if that gives an error, try "-c1" instead. Hopefully, the optical port lights up after that.
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