After a routine pacman -Syu which included a kernel upgrade from linux-raspberrypi4 5.10.43-2 => 5.10.44-1 my Pi 4B 8G became unusable. I have gdm (GNOME deskop manager) installed as a graphical login and, while it would draw the screen, the keyboard and mouse were then unresponsive with the green LED continuously lit. Powering off and on again did not seem to fix the issue. ANyone else seen that?
I do have a copy of the root partition from when it was unusable so it would be interesting to know if it is easy to extract information from the system journal. I'll check out the documentation for journalctl.
I have got back to a workable state again but this did not seem to be straightforward. Is there a recognised way to roll back to a previous version of a package when the SD card is mounted on another system? I did look at pacman --sysroot but this mentions doing a chroot which would, I suspect, run into problems as the other system I had available was an X86 PC.
For this non-booting case, would it simply be better to backup the /boot partition from time to time?