*** This bug is a duplicate of bug 1848790 ***
https://bugs.launchpad.net/bugs/1848790
@reply #21,
The simplest workaround is to plug the sd card into a cardreader and
connect the cardreader to computer, then edit $mount_folder/system-
boot/config.txt
Add total_mem=3072 in the section [pi4], just like below:
[pi4]
kernel=uboot_rpi_4.bin
max_framebuffers=2
total_mem=3072
Then reboot, you could you the usb keyboard now, after installing the
testing kernel, you could remove total_mem=3072.
And another way to login is to use ssh.
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https://bugs.launchpad.net/bugs/1848703
Title:
Raspberry Pi 4 - USB Bus not detecting any devices
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