TroubleShooting Q/A

Help! Qjackctl is not able to shut down jack

This is a known bug with jackdbus on 12.04 LTS, while actually 14.04LTS is the oldest supported release. I'm missing the Wiki discussion feature for the Ubuntu Wiki, where such things could be discussed. To shut down jackdbus, use this command in a terminal:

killall -9 jackdbus

I can't seem to get sound when I use qjackctl

If you can start jack, but there's no sound, there are two likely reasons for this.

  1. If you have multiple audio devices, you need to make sure to choose the right device after each boot in Qjackctl -> Setup -> Interface

  2. Your audio device is muted, but the controls aren't visible to Pulseaudio. For PCI and USB, use alsamixer or a specific mixer for your device. For firewire use ffado-mixer.

See also

Ubuntu troubleshooting

Other troubleshooting guides


UbuntuStudio/TroubleShooting (last edited 2018-04-02 13:09:38 by ralf-mardorf)