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

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

--- Comment #12 from Henrich Hartzer <h@hartzer.sh> ---
The crash I had on the T400 (with 14.2 and kern.smp.disabled=1, so I can boot)
with swaymsg "output * power off" is reproducible on the R500 *if* I boot with
kern.smp.disabled=1. Thus, I think disabling SMP seems to cause, one way or
another, other issues, that aren't related to the problem of requiring SMP
disabled in the first place.

With SMP enabled on the R500, I did some video playback and had no crashes. I'm
assuming that the display blanking crashes and video crashes are related and
happen when SMP is disabled.

I also found this bug report that sounds very similar, but about different
hardware: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284275

I opened https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286018 for the
kern.smp.disabled=1 crashes because I feel it is probably a separate issue.

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