[Bug 255745] resume on T490 Thinkpad often broken after upgrade 12 -> 13

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255745

--- Comment #7 from Ulrich Spörlein <uqs at FreeBSD.org> ---
I'm willing to bisect this, but could use some help. It seems that stable/12
was branched off main around 2y7mo ago. So I would need to downgrade to current
of that time, then bisect up to the latest main (assuming this also happens on
14-CURRENT).

What are the chances of that downgrade working? I would rebuild world first,
install that and hope that it mostly works with the newer kernel. Then
downgrade the kernel, yes?

Of course Xorg and co would need a full recompile as well, ugh. I'll probably
try to reproduce this in single user first, that would make the later bisect
testing a lot easier.

Better ideas? Lucky me I didn't `zpool upgrade` yet, eh?

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