[Bug 270707] Installer media doesn't boot on Thinkpad T14s Gen 3 (Ryzen 7 Pro 6850U)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270707

--- Comment #30 from John Baldwin <jhb@FreeBSD.org> ---
Generally speaking, the last line of dmesg is not always a good indicator of
the source of a hang once the kernel has finished its attach of devices.  In
particular, most sysinits aside from probing devices do not generate any output
on the console, so once the kernel has finished its attach of devices, the last
line will just be the last device probed until single user starts.

One option that can work is to set 'debug.verbose_sysinit=1' from the loader. 
This will generate a lot of output, but if the kernel hangs during boot it will
print out the last SYSINIT function the kernel called before the hang.

It's not clear from the various followups though if this is one bug or many, or
if disabling uart1 works only for some cases but not others?  Also, it's not
clear if the internal keyboard not working is true for everyone, or only some
folks.

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