[Bug 253801] graphics/drm-fbsd13-kmod panic when resuming from sleep

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253801

            Bug ID: 253801
           Summary: graphics/drm-fbsd13-kmod panic when resuming from
                    sleep
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: patovm04 at gmail.com
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Created attachment 222765
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222765&action=edit
photo showing interesting console errors

OS: FreeBSD 13.0-BETA3
Graphics: Intel HD Graphics 5500
Driver: modesetting

Sometimes, graphics won't work after waking up from suspend. It shows:
"drmn0: Failed to idle engines, declaring wedged!"
Note this doesn't cause a panic-reboot.

Other times, it seems to resume just fine, but triggers a panic after a few
seconds of use. It either logs me out of my running session, or instantly
reboots my system.

These issues don't happen all the time. Actually, I'm not sure how to
consistently reproduce them :(
But as far as I can tell, it's been happening since at least 13.0-ALPHA3.

Possibly a duplicate of:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253797

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