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

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From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 18 Jul 2021 17:52:52 UTC

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

--- Comment #18 from John Grafton <john.grafton@runbox.com> ---
I'm currently bisecting the git repo to hunt down where the problem was
introduced.  It's slow going but I'm making a bit of progress.  Luckily, the
issue is easily reproducible on my X1 Carbon Gen6.

FreeBSD-src commit 6abe97c0140d54d3520c30517b2bdebc3de92a62 is the first I've
found in 13.0-CURRENT that doesn't appear to fail.  This requires the DRM port
drm-current-kmod-5.4.62.g20201109_1 from Nov 2020 (FreeBSD-ports commit
25e14f16ef2ccfe80e1b45168318d777369ec9ed).

Time has opened up for me in the next couple of weeks and I'll continue
researching.

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