I have the same problem with Dell Latitude E7440, Ubuntu 20.04, after an
update to kernel 5.4.0-92, and having linux-firmware 1.187.24.

1) I'm using a UGreen USB Switch to switch between the inputs of keyboard, 
mouse and audio between two stations
2) After the kernel and linux-firmware upgrade I did a reboot, the system took 
much longer to start (console shown "failed to enumerate USB devices"), when it 
did boot external keyboards and mouse wasn't working
3) Pluging in any device directly to laptop's USB port does not work
4) I've managed to get the external keyboard and mouse to work by disabling the 
Bluetooth in Ubuntu settings and rebooting back to 5.4.0-91 (worked via USB 
Switch)
5) However after another reboot to 5.4.0-91, USB ports stopped working again

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https://bugs.launchpad.net/bugs/1956518

Title:
  linux-firmware 1.187.24 may crash USB ports

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