Weird "No Input or Output Device" behaviour after switching DisplayPort Cables

nikgnomic · 20 February 2021 11:26

I do not see how changing GPU display connections could affect the audio card if the HDMI audio is deactivated and not in use

But if you are only using the one audio device It may help to blacklist the HDMI audio

Mic boost gets muted after reboot

The audio card may work better if it is the only device available for system, or the first available device ahead of the HDMI audio

create a file with a text editor (any text editor will do but Manjaro has nano on every DE)
sudo nano /etc/modprobe.d/alsa-cards.conf 
add this text to the file to remove the HDMI audio
blacklist snd_hda_intel
Or this to keep the HDMI, but relegate it to 2nd device
options snd slots=snd_virtuoso,snd_hda_intel