[Bug 271995] Graphics performance suffers after S3 suspend/resume

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271995

            Bug ID: 271995
           Summary: Graphics performance suffers after S3 suspend/resume
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: brtastic.dev@gmail.com

I am testing this by running some 2D/3D graphical apps, and they all seem to
behave the same.

Reproducing on Thinkpad T480. Right after booting, I get good performance from
those apps and htop readings are not out of the ordinary.

After S3 suspend and resume, things get different. Applications show much lower
performance, some becoming unusable, and htop shows up to 800% CPU usage.

I'm running dwm on X11 modesetting with latest drm-kmod installed from ports.
Tried resetting Xorg / powerd after resuming, but didn't help.

/var/log/messages and /var/log/Xorg.0.log show no new errors after resuming.

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