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

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

--- Comment #31 from Anthony Williams <anthony@adfw.co.uk> ---
(In reply to Mark Millard from comment #28)

top on 14.1 says 2 CPUS.

A bit of another piece to the puzzle, however!

Booting up the 14.1-R memstick to gather the top data, I found it hung on
boot...

From a sample of several reboots, I found that with SMP enabled, and selecting
the various options from the loader menu:

* No serial console, no verbose = hang
* Serial console, no verbose = boots
* No serial console, verbose = boots
* serial console, verbose = boots

So there seems to be a variant of this issue in 14.1-RELEASE as well.

Could a possibility that either verbose or serial console boot options slows
the boot process down enough to escape whatever is causing the lockup?

I now recall something like this happening when I upgraded from 14.0-RELEASE to
14.1-RELEASE, but I thought it was i915 related. I set (and kept) verbose boot
in loader.conf when diagnosing it back then, and that seems to have been
sufficient to boot 14.1-RELEASE reliably, but it's not "good enough" for 14.2.

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