How to get dmesg before system hang?

guyuming · Apprentice Joined: 19 Nov 2020 Posts: 236

my system hangs now and then, ctrl + alt + f(1-7) to switch tty also unresponsive.

if i press the power button, i can see messages on screen says system shutting down step by step, like everything is OK.

I am trying to check dmesg, but how can i find the dmesg of the session before hang?

I found only /var/log/dmesg, no /var/log/dmesg.0 or /var/log/dmesg.1.

And i am using OpenRC with seatd, no systemd or elogind.

Banana · Veteran Joined: 21 May 2004 Posts: 1415 Location: Germany

I'm not sure right now and I can think of other resources:

X11 logs: /var/log/ or in ~/.local/share/xorg/

https://wiki.gentoo.org/wiki/OpenRC#Logging

Or any other log file available in /var/log
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wjb · Posted: Sat May 11, 2024 9:52 am Post subject:

/var/log/everything/current includes the date-stamped dmesg messages from sessions - logrotate moves to these other files under /var/log/everything at intervals and deletes them eventually.

NeddySeagoon · Posted: Sat May 11, 2024 10:29 am Post subject:

guyuming,

That sounds like an Xorg issue or something graphics related as the system still does the 'right thing' in response to the power button.

Can you ssh in and get dmesg that way?
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freke · Posted: Sat May 11, 2024 1:11 pm Post subject:

On OpenRC you can, in /etc/conf.d/bootmisc

Hu · Administrator Joined: 06 Mar 2007 Posts: 21764