Gen1 Scarlett 18i6 won’t recognize XLR and line jack at the same time (Linux) – Hardware (Instruments and Effects) Forum

I’ve been using my Focusrite Scarlett 18i6 with this same computer for about a year, with no problem. Recently, I upgraded my Ubuntu version to 24.04 and now I’m finding that when I open reaper and try to use my inputs, it will ‘hear’ the Mic in (XLR), or the guitar (1/4 jack), but not both. First, I was only getting the mic. Then I tried unplugging the mic and line, turning the Scarlett off and on, then plugging in the line. Now, Reaper can hear the line but not the mic.

It doesn’t matter if I swap the two inputs; it still only seems to want to recognize one or the other, but not both.

This problem wasn’t happening before, so I don’t know if it’s a kernel issue or what. I never needed to install a driver for this unit, and I can’t run the GUI for it under wine because it’s saying it needs some kind of security update which I don’t think I can install in wine. I went into Alsamixer and set both input to Hi-Z, and this didn’t fix the problem. Any ideas?