Public bug reported:
Since kernel 4.13 Linux supports an USB debug console with passive USB 3.x
host-to-host cables aka "USB 3.0 super-speed A-to-A debugging cable".
Beginning with kernel 4.16 a serial port (/dev/ttyDbC) has been added
(https://www.kernel.org/doc/html/v4.16/driver-api/usb/usb3-debug-port.html#serial-tty).
I suggest to enable USB DbC by enabling the kernel options
"CONFIG_EARLY_PRINTK_USB_XDBC=Y" and "USB_XHCI_DBGCAP=Y" in Ubuntu
kernels >= 4.16 for Bionic HWE and newer ubuntu versions.
It would also be great to get feedback about line speed from others as
USB_XHCI_DBGCAP serial ports could be used for network connections via
tun/tap devices or PPP/SLIP.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1821537
Title:
Enable kernel options CONFIG_EARLY_PRINTK_USB_XDBC and USB_XHCI_DBGCAP
for serial Superspeed(+) connections with kernels >= 4.16
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