I recommend searching this thread and the forum more generally for this jack fail error, there are plenty of posts going into possible causes as it’s a very common error message when creating a DIY norns.
If you can post a macro photo of the DAC chip it might be useful as poor solder joints here can cause this error.
i am the author of the PR. it worked in some cases but also caused a crash with korg SQ-1. i’m rarely motivated to set up norns hardware these days and would really appreciate more testing from users and developers (/aspiring developers.)
i don’t like to merge things that i’ve observed to cause crashes. (in fact i would categorically refuse to merge this as is, since the crash case applies to previously supported and working use cases.) in this case it would be super excellent if anyone with a korg sq-1 can test. (or other device that fits the profile of 1 bidirectional endpoint and one output-only.) i am happy to help with rebuilding. (every norns shipped comes with the necessary build tools installed.) if you want to help please DM me or (better) ping the github conversation.
i agree this is an annoying limitation to have, hence my efforts to move it along.
BTW i’ve owned 2x logidy um3 devices, one simply never worked with any linux system for reasons unknown. (worked ok with mac/win.)