Comment 5 for bug 1848790

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