On Tue, Nov 16, 2021 at 10:29:00PM +0100, Valentin Vidi?? wrote: > Do you have console=ttyUSB0,... set? What does /proc/consoles say? No, I did not. Now, I have added on a test machine: console=ttyUSB0,9600 console=tty0 to /etc/default/grub and started upgrade-grub and rebooted. I had and I still have: root@gluster-1:~# cat /proc/consoles tty0 -WU (EC p ) 4:1 However, the command line seems correct and multiple console= are valid [1]: root@gluster-1:~# cat /proc/cmdline BOOT_IMAGE=/vmlinuz-4.19.0-18-amd64 root=/dev/mapper/vg1-root ro console=ttyUSB0,9600 console=tty0 quiet raid0.default_layout=1 It does not seem to be work for some reason. Let's try with one ttyUSB console specification only: does not boot anymore. Does not print anything on ttyUSB0. Had to recover using a grub kernel command line edition at boot time. Any idea? NB: the USB serial port works with cu bidirectionnally once the system is booted, but %break has no effect. [1] https://www.kernel.org/doc/html/latest/admin-guide/serial-console.html _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
