UMC204HD stops working when i start jack2, but headphone works

[palsen123]

Hi, so i just moved to linux on my desktop and wanted to try out making music on there. I'm using arch with KDE as my DE.

Recently i got a UMC204HD audio interface which i love and it is working perfectly on windows. However when i start up jack2 my audio interface can neither detect inputs nor play outputs in pavucontrol, but it works fine when i don't run jack2. Also while jack2 is running i can still use my headphones speaker and mic without any problems.

This is the log from when i start jack2, no errors occurs

Code: Select all

Tue Oct  6 10:50:36 2020: Listening for D-Bus messages
Tue Oct  6 10:50:39 2020: Starting jack server...
Tue Oct  6 10:50:39 2020: JACK server starting in realtime mode with priority 20
Tue Oct  6 10:50:39 2020: self-connect-mode is "Don't restrict self connect requests"
Tue Oct  6 10:50:39 2020: Acquired audio card Audio3
Tue Oct  6 10:50:39 2020: creating alsa driver ... hw:U192k,0|hw:U192k,0|1024|2|192000|2|4|nomon|swmeter|-|32bit
Tue Oct  6 10:50:39 2020: configuring for 192000Hz, period = 1024 frames (5.3 ms), buffer = 2 periods
Tue Oct  6 10:50:39 2020: ALSA: final selected sample format for capture: 32bit integer little-endian
Tue Oct  6 10:50:39 2020: ALSA: use 2 periods for capture
Tue Oct  6 10:50:40 2020: ALSA: final selected sample format for playback: 32bit integer little-endian
Tue Oct  6 10:50:40 2020: ALSA: use 2 periods for playback
Tue Oct  6 10:50:40 2020: graph reorder: new port 'system:capture_1'
Tue Oct  6 10:50:40 2020: New client 'system' with PID 0
Tue Oct  6 10:50:40 2020: graph reorder: new port 'system:capture_2'
Tue Oct  6 10:50:40 2020: graph reorder: new port 'system:playback_1'
Tue Oct  6 10:50:40 2020: graph reorder: new port 'system:playback_2'
Tue Oct  6 10:50:40 2020: graph reorder: new port 'system:playback_3'
Tue Oct  6 10:50:40 2020: graph reorder: new port 'system:playback_4'

At the moment i'm completely lost on why it doesn't work.

Edit 1: I tried to start the PulseAudio bridge but it stops right after starting:

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Tue Oct  6 11:26:31 2020: New client 'lsp' with PID 10573
Tue Oct  6 11:26:31 2020: Client 'lsp' with PID 10573 is out

[CrocoDuck]

That is the expected behavior pretty much, unless you configure PulseAudio to work in tandem with jack. I do not normally do this as I am happy to have all of my audio through jack the (now very rare) times I do audio stuff. Maybe someone else will provide better pointers. For now some documentation that you might find useful:

https://wiki.archlinux.org/index.php/JA ... ection_Kit

This would be especially relevant:
https://wiki.archlinux.org/index.php/Pu ... rough_JACK

Note that those pages are from the Arch wiki. What is your distro?

[Baggypants]

I enable jackdbus in qjackctl and pulseaudio sorts itself out for me. I run Fedora.