Series tracked for Cosmic, as per Seth's comment: USB_XHCI_DBGCAP has been enabled since cosmic. I've now enabled CONFIG_EARLY_PRINTK_USB_XDBC as well in disco.
** Also affects: linux (Ubuntu Cosmic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Status: Confirmed => Fix Released ** Changed in: linux (Ubuntu Cosmic) Status: New => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 Status in linux package in Ubuntu: Fix Released Status in linux source package in Cosmic: Confirmed Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821537/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp