User on lingon on raspberry pi forum posted the following:

The USB-problem concerning the Raspberry Pi 4GB RAM model might be due to the 
issue seen earlier that using more RAM than 3072 MB breaks the USB:
https://www.raspberrypi.org/forums/view ... 6&start=25

The issue was solved by a kernel patch:
https://www.raspberrypi.org/forums/view ... 0#p1517839

and the kernel patch was this one:
https://github.com/raspberrypi/linux/is ... -520269280

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https://bugs.launchpad.net/bugs/1848703

Title:
  Raspberry Pi 4 - USB Bus not detecting any devices

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