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

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

            Bug ID: 255745
           Summary: regression: resume on T490 often broken after upgrade
                    12 -> 13
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: uqs at FreeBSD.org

Under stable/12 this T490 thinkpad was suspend/resuming like a champ. I've
recently upgraded to stable/13 and things are busted.

Now this might be related to
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253288 (but I've disabled
that module), but often when resuming, the laptop will no longer power up and
eventually the fans start spinning.

I did some tests with suspend/resume, and the hang seems to occur only after a
longer uptime or when suspending overnight. It's quite non-deterministic.

I could successfully suspend/resume 5 times yesterday between 10am and 10pm.
Then left it on overnight. I wanted to reboot this morning and figured I'll
test suspend/resume once more. It did not come back from suspend when I opened
the lid again 2 minutes later. The typical Thinkpad light was still pulsating
though.

How to even start to debug that? What where the changes around suspend/resume
between 12 and 13?

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