[Bug 240729] ThinkPad T420s - suspend/resume does not work after 12-STABLE (rev?) -> 12.1-BETA1 update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240729

--- Comment #12 from pete at nomadlogic.org ---
Vermaden,
I think I have found what was breaking on my end.  I had an older version of
the drm-kmod package installed which I had forgotten to check previously. 
After rebuilding the package from the ports tree then rebooting suspend/resume
is now working as expected.

One thing to note is that when I attempt to use the pkg hosted by freebsd.org
my system panics on boot with a page fault.  So it seems critical to not use
the upstream pre-build binary but to roll your own and install that.  for
reference this is the version i have installed:
drm-fbsd12.0-kmod-4.16.g20190814

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