[Bug 285867] 14.2-RELEASE kernel hangs on Thinkpad T400

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285867

--- Comment #5 from Henrich Hartzer <h@hartzer.sh> ---
(In reply to Tomoaki AOKI from comment #4)

Thank you for replying!

That's interesting about loader.conf vs rc.conf for loading modules. Very good
to know.

I load i915_kms in rc.conf. However, it's not the issue -- I commented that out
when upgrading since I knew it wasn't going to work before compiling it for
14.2.

The installer also hangs in the same manner. No ctrl+t, no panic, etc. I have
to use safe mode on it as well, which rules out any other non-base kernel
modules.

I feel that the most interesting detail is that fsck can run and complete, then
it will hang. And that even in single user mode, it will hang a very seconds
after getting to the shell prompt (booting from installer or already
installed.) Single user mode (without safe mode) behaves identically between
the installed system and the installer.

Now I did figure out a bit more about the crash with sway. I have a
configuration to turn off displays after ten minutes. The hang starts as soon
as: swaymsg "output * power off" is run. I can reproduce it easily. So for now
I just have it lock the screen and not turn the screen off. I feel like that
deserves its own issue if there isn't another one for it already.

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