@Paul: Thanks, this link works, but the script does not:
$ sh adevices.sh
Part I: ALSA
Advanced Linux Sound Architecture Driver Version k5.3.0-46-generic.
adevices.sh: 11: Syntax error: Bad for loop variable
(Error occurs as well on current Ubuntu as Linux Mint)
Anyway, is there something like a checklist to work through if Ardour does not output sound on Linux?
Configuration changes before Ardour stopped outputting sound were:
- Removed a graphics card because Ardour’s UI responded with annoying lags and delays;
- switched to on-board graphics (Intel), Ardour’s UI responds now smoothly;
- sound output from mainbaord is now routed through the HDMI cable and played back on the monitors built-in speakers;
- reconfigured audio settings for OS; other audio stuff like Audacity or VLC works fine.
Solved one problem, got a new one as bonus.
Not using Jack for Ardour, just ALSA. So I assume Ardour does not use the same audio stack as other applications and that Ardour does not understand that the audio signal comes through an HDMI cable.
Weird side notice: If I connect a 3.5" headphone directly to the mainboards signal output, Ardour outputs audio on the headphones. Just not on the speakers.
I don’t see a problem in Ardour’s mixer, and in Ardour’s Global Settings I can not find something related to sound output. Where do I go from here?