I also have Skylake laptop (ASUS GL502VM) with a GTX 1060 which is always in Discrete mode (I can't use it in hybrid mode at all) and I have the same or similar problem (HDMI video: Ok / HDMI audio: Doesn't work). In my case "lspci -H1" doesn't even list the NVIDIA Audio device.
Any idea of how to fix this? ** Also affects: pulseaudio (Ubuntu) Importance: Undecided Status: New -- 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