Sound output not selectable between HDMI/DP devices.

Y

yudouxie

H310 chipset + Kabylake 8100 CPU
has an HDMI and a DP port for displays.
DP connected to a 4K TV.
HDMI connected to a monitor.
I think I have disabled Realtek sound chip from BIOS, don't know why it's still showing up in FreeBSD.

$ cat : dev/snd/stat
pcm0: <Realtek ALC887 (Analog)> (play/rec)
pcm1: <Realtek ALC887 (Analog)> (play/rec)
pcm2: <Intel Kabylake (HDMI/DP 8ch)> (play) default

Now I can have the sound from the DP port only but no way to switch it to the HDMI, even I turn the TV off or disable the TV from display settings.

Any advice would be appreciated.
 
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