Jack failure after upgrade -- Raspi 4

[Bridgee]

It seems to be the kernel issue, and here’s a temporary solution:

Missing USB ports with realtime kernel on pi4 4gb

I have had the same problem with a Rpi 4 4Gb using PatchOS for Modep: after an upgrade earlier this month, I ended up with no USB devices recognised (lsusb just showed the same one line as @risktoparkrageram above). Using dmesg, I could see that the USB devices were recognised during boot time, it’s just that after boot, they were not available Not willing to reinstall, I have found the following page describing the same problem: Raspberry Pi 4 4Gb modems : USB ports don’t work on ubuntu 19-10.…