Just wanted to chime in to report I have the exact same problem (using Ubuntu 16.04), with the same GPU, GTX 1060 (in an MSI Apache Pro). No matter what I do, I cannot get the HDMI sound device to show up...
One thing that changed things for me is if I restart the PC with the HDMI cable plugged in, I do get the HDMI device - but unfortunately it completely messes up the screens (it somehow thinks the external TV is my main monitor, laptop screen becomes unclickable... it really is a mess). Could this be connected to the graphics card drivers? I'm using the latest from the Ubuntu packages, 375. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1377653 Title: HDMI sound output not detected / NVIDIA optimus laptop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1377653/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
