[CentOS] C7 and default sound

Mon Sep 24 11:58:11 UTC 2018
Jerry Geis <jerry.geis at gmail.com>

When I right click on desktop and bring up "sound". I have two items.

Digital output (S/PDIF) buildin audio
HDMI/Displayport 2 - Gk208 HDMI audio controller

It seems I always default to S/PDIF.... How can I get this to default to
HDMI always ? If I select HDMI and reboot it goes back to S/PDIF. I am
running pulse audio.