I also found this: To use a serial port as console you need to compile the support into your kernel - by default it is not compiled in. For PC style serial ports it’s the config option next to menu option:
Character devices ‣ Serial drivers ‣ 8250/16550 and compatible serial support ‣ Console on 8250/16550 and compatible serial port You must compile serial support into the kernel and not as a module. at https://www.kernel.org/doc/html/latest/admin-guide/serial- console.html -- 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/2009283 Title: linux: CONFIG_SERIAL_8250_MID=y Status in linux package in Ubuntu: Confirmed Bug description: Starting from 5.19 HWE kernel, this option became as dedicated module instead of being compiled into the kernel. 5.19 hwe-next also has CONFIG_SERIAL_8250_MID=m On 5.15 it was OK ~$ uname -r 5.19.0-32-generic $ cat /boot/config-5.19.0-32-generic | grep 8250_MID CONFIG_SERIAL_8250_MID=m Please make it CONFIG_SERIAL_8250_MID=y for all the future kernels. Previous ticket: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1967338 Some discussion: https://lists.ubuntu.com/archives/kernel-team/2022-March/128690.html Thanks! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2009283/+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
