MIDI drops with Ardour 9.7 on Ubuntu 26

#1

Hi -

I’ve recently upgraded my rig to Ubuntu 26, and am experiencing a problem with Ardour 9.7 that I didn’t see on Ubuntu 24. It’s Pipewire-related, so the interaction is probably with Pipewire 1.6.x; Ubuntu 24 used Pipewire 1.0.5. I’m running on ARM (Raspberry Pi 5); not sure if that’s relevant or not.

The problem appears (for me) because I have a MIDI input bus that I connect my physical (and virtual) MIDI controllers to and then connect the output of that bus to five or six other tracks. The symptom is that MIDI messages get dropped before they get to the other tracks. The problem is related to the fan-out. If I connect the input controller directly to one of those other five tracks, it works fine.

And it’s intermittent - sometimes I see 100% drops, sometimes roughly half of the messages get through.

I’m investigating it, and will report when I know more. In the meantime, I just wanted to open a thread here in case others are running on Ubuntu 26 and see something similar.

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#2

Same issue, I moved to classic jack to solve that problem. I wanted to move back to pipewire now, but I guess better not…

Arch linux in my case, with an earlier Ardour version. Same setup, single buss to hardware, from there to multiple instrument tracks in ardour. Same issue, hardware to buss worked, but nothing got to the instruments…