Ubuntu: HDMI port not detected on Ubuntu 18.04 - YouTube
hdmi output doesnt work in ubuntu 18.04 - Linux - NVIDIA Developer Forums
Unable to use a second screen on NVIDIA or NVIDIA/INTEL · Issue #927 · pop-os/pop · GitHub
Solved: External Monitor not working. Ubuntu, nvidia - Dell Community
Installed Openbox in POP_OS (A little edited Ubuntu 18.04), didn't get access to the laptop screen, only external monitor, and extremely laggy. Menus coming over desktop by right-click menu also never disappear.
sound - HDMI audio not working on ubuntu 18.04 - Ask Ubuntu
Linux Station HDMI connectivity : r/qnap
HDMI failing or no video - VIM2 - Khadas Community
hdmi output doesnt work in ubuntu 18.04 - Linux - NVIDIA Developer Forums