Computer frozen again, journalctl --list-boots show only single boot, how to debug?

Hello, which commands are You running after your computer freeze and you have to reset it in order to discover the possible cause of the freeze on 5.13.15-1-MANJARO with XFCE?

journalctl --list-boots shows only one entry
sudo dmesg -T|head shows only entries of the current boot, /var/log/journal too

freeze description: after returning to computer, USB ports are powered but keyboard,mouse does not make computer respond (black screen), changing port does not help, CPU fan is low RPM, network leds indicate interrupted network activity.

Beside on how to log previous boot activity and access it, i am also interested which keywords i may want to lookup in the log. Thank you

There is a decent guide here:

just read and found no answer to my questions

theses log

sudo journactl -p 3 -xb

Yes, but it does not show the files from previous boot, only from current… btw You have a typo in the utility name.

exists some command in journalctl for clear logs …
we can change (no) storage in /etc/systemd/journald.conf or /etc/systemd/journald.conf.d/*

find available logs (read dates) :

ls -l /var/log/journal/*/*.journal

journalctl --verify show also theses files
we can read one (old) file, but journalctl without “–file” usually read all this files:

journalctl  --file=/var/log/journal/xxx/yyy@zzz.journal

i had: $ grep storage /etc/systemd/journald.conf

quoting from yours linked article: “auto” behaves like “persistent” if the /var/log/journal directory exists

so i have un-commented the line having:
grep -v “#” /etc/systemd/journald.conf

hopefully on next PC freeze/reset it will preserve the log… and i will try suggested command sudo journalctl -p 3 -xb