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TLDR: I added a GTX 1080 in addition to my current graphics card, and now default audio is not working.

Before:

I had a working sound on Ubuntu 16.04, 4.15.0-38-generic. I had a GTX 740 graphics card and an NVidia driver (for CUDA). And a sound was working (from whatever is on the motherboard). Headphones worked, back audio jack worked. I installed a second graphics card GTX 1080 (which has an hdmi output), (no upgrade to software).

After:

Now I currently have 1 graphics card for gui/rendering and another graphics card (1080) for tensorflow (aka not used for visuals).

*****~$ pacmd list-cards
0 card(s) available.

However,

*****:~$ lspci | grep -i audio
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:1b.0 Audio device: Intel Corporation 9 Series Chipset Family HD Audio Controller
01:00.1 Audio device: NVIDIA Corporation GK107 HDMI Audio Controller (rev a1)
02:00.1 Audio device: NVIDIA Corporation Device 10f0 (rev a1)

Additionaly sound settings says "Dummy Output"

Attempts:

  1. Only HDMI audio since installing Nvidia card: onboard audio device has disappeared

    Bios does not have an option for auto detecting sound card.

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