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HDMI auidio converter : Unplugged (Fedora 24/25)

Hello Everyone,

This is my first post. Long time user of Fedora (going back to Yarrow).

My System: Kernel: 4.8.15-300.fc25.x86_64 x86_64 (64 bit gcc: 6.2.1) Desktop: Cinnamon 3.2.7
dm: gdm Distro: Fedora release 25 (Twenty Five)

Machine:
Device: laptop system: LENOVO product: ThinkPad W530 Chassis: type: 10 Mobo: LENOVO

Graphics:
Card: NVIDIA GK107GLM [Quadro K1000M] bus-ID: 01:00.0 chip-ID: 10de:0ffc

Display Server: Fedora X.org 119 driver: nvidia Resolution: 1920x1200@59.95hz

GLX Renderer: Quadro K1000M/PCIe/SSE2 GLX Version: 4.5.0 NVIDIA 375.26 Direct Rendering: Yes

Audio: Card-1 NVIDIA GK107 HDMI Audio Controller driver: snd_hda_intel bus-ID: 01:00.1 chip-ID: 10de:0e1b Card-2 Intel 7 Series/C216 Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 chip-ID: 8086:1e20 Sound: Advanced Linux Sound Architecture v: k4.8.15-300.fc25.x86_64

Here's my issue:

I have an audio converter. It takes HDMI as input, and outputs to Optical and HDMI. I have used it in the past (Fedora 23) to connect my audio receiver to my computer (for digital audio).

pavucontrol shows all the outputs as "unplugged" for this card (GTK107 HDMI Audio Controller).

As I say - this was working in 23... But I've forgotten how I got it working. I know I had to reconfigure alsa - and I'm pretty sure I had to configure X (even though I didn't run a display on it).

Any pointers?

Many Thanks!

--Ken