[LINUX] Solution when HDMI audio output is not possible on Ubuntu 20.04.1 LTS


I usually connect my own PC to an external monitor and operate it on Ubuntu. Audio is output from the monitor via HDMI. However, the sound stopped coming out a few days ago. When I check Sound in Setting, HDMI cannot be selected in Output Device, or it does not appear. Only Digital Outputs (S / PDIF) can be selected. When I google it, it seems to be a common problem from long ago. The information was out of date and some methods didn't work, so make a note of the methods you were able to solve. Screenshot from 2020-09-29 23-17-00.png


PC: Homebrew PC CPU: Ryzen5 3600 Graphics board: NVIDIA GeForce GTX 1660 OS: Ubuntu 20.04.1 LTS

Reference site

Install NVIDIA driver on Ubuntu 18.04


Rather, it's a reference site. Thank you @kannkyo: bow_tone1:

1. Check the drivers with sudo ubuntu-drivers devices

$ sudo ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:03.1/0000:09:00.0 ==
modalias : pci:v000010DEd00002184sv000010DEsd00001324bc03sc00i00
vendor   : NVIDIA Corporation
model    : TU116 [GeForce GTX 1660]
driver   : nvidia-driver-435 - distro non-free
driver   : nvidia-driver-450 - distro non-free recommended
driver   : nvidia-driver-418-server - distro non-free
driver   : nvidia-driver-450-server - distro non-free
driver   : nvidia-driver-440-server - distro non-free
driver   : xserver-xorg-video-nouveau - distro free builtin

2. Install the driver with sudo ubuntu-drivers autoinstall

$ sudo ubuntu-drivers autoinstall

Then the NVIDIA driver will be installed automatically

3. Select HDMI from Output Device in Sound of Settings

Now you can safely output audio via HDMI. Screenshot from 2020-09-29 23-39-18.png

I was impatient that the sound suddenly stopped, but I don't know the reason. Did the driver update and cause a problem because you are doing sudo apt update frequently? Anyway, it was good that installing the NVIDIA driver solved the problem.

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