My Ubuntu system has stopped producing any sound what-so-ever, since I used a set of Bluetooth headphones with it, though the Bluetooth may be unrelated, it was just the last thing I used.
First the obvious: No the headphones are not still connected, and Bluetooth is switched off. It is not muted in the system tray, and i do not have the program making the sound muted. I have tried several sources including the sound test in settings/sound. I have done both
sudo apt-get update and
sudo apt-get upgrade as well as rebooted the system.
I have also tried:
alsamixershows the audio channels to be not unmuted and with volume, also auto-mute is disabled.
pavucontrolshows several port options (headphones, speakers and line out) ports. Each showing a volume metre that is responsive to the audio sources on the computer, and the line out and headphones ports are responsive to having something plugged into them; registering plugged in/unplugged but no sound through either.
- input devices in both the sound tab of settings, and
pavucontrolis responsive to sounds I make, so it appears the microphone is working.
- I have reinstalled pulseaudio and alsa-base using
sudo apt remove --purge alsa-base pulseaudio sudo apt install alsa-base pulseaudio
as well as reloading alsa with
sudo alsa force-reload
Everything appears perfectly normal, except I get no sound output from speakers or headphones.