Ubuntu: Jack does not see soundcard inputs



Question:

I am trying to record my guitar via an usb-soundcard (umc404), but Jack does not seem to know any inputs of my soundcard. I am using the UI of Ardour5 for starting Jack.

@Linux-PC:~$ jack_lsp  system:capture_1  system:capture_2  system:capture_3  system:capture_4  system:playback_1  system:playback_2  system:playback_3  system:playback_4  

ALSA seems to recognize them (?):

Linux-PC:~$ amixer -c2  Simple mixer control 'Mic',0    Capabilities: cvolume cswitch    Capture channels: Front Left - Front Right - Rear Left - Rear Right    Limits: Capture 0 - 127    Front Left: Capture 127 [100%] [0.00dB] [on]    Front Right: Capture 127 [100%] [0.00dB] [on]    Rear Left: Capture 127 [100%] [0.00dB] [on]    Rear Right: Capture 127 [100%] [0.00dB] [on]  Simple mixer control 'Mic',1    Capabilities: cvolume cvolume-joined cswitch cswitch-joined    Capture channels: Mono    Limits: Capture 0 - 127    Mono: Capture 127 [100%] [0.00dB] [on]  Simple mixer control 'UMC404HD 192k Internal Clock Validity',0    Capabilities: pswitch pswitch-joined    Playback channels: Mono    Mono: Playback [on]  Simple mixer control 'UMC404HD 192k Output',0    Capabilities: pvolume pswitch    Playback channels: Front Left - Front Right - Rear Left - Rear Right    Limits: Playback 0 - 127    Mono:    Front Left: Playback 119 [94%] [-8.00dB] [on]    Front Right: Playback 119 [94%] [-8.00dB] [on]    Rear Left: Playback 119 [94%] [-8.00dB] [on]    Rear Right: Playback 119 [94%] [-8.00dB] [on]  Simple mixer control 'UMC404HD 192k Output',1    Capabilities: pvolume pvolume-joined pswitch pswitch-joined    Playback channels: Mono    Limits: Playback 0 - 127    Mono: Playback 127 [100%] [0.00dB] [on]  

How do I get Jack to see them?


Solution:1

as @ridgy commented above, I had to disable pulseaudio first. I used pulseaudio -k, there may be more elegant ways, but it works now :).


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