[Bug 273369] x11-servers/xorg-server: "Cannot run in framebuffer mode" after updating to 21.1.8_4,1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273369

            Bug ID: 273369
           Summary: x11-servers/xorg-server: "Cannot run in framebuffer
                    mode" after updating to 21.1.8_4,1
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Created attachment 244369
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=244369&action=edit
dmesg for server in question

After updating all packages on an existing (working) 13-stable system, startx
fails with "Cannot run in framebuffer mode. Please specify busIDs for all
framebuffer devices".  Rolling back just xorg-server to the previous installed
version (21.1.8,1) from /var/cache/pkg fixes the problem.

I'm not absolutely certain, but I suspect https://reviews.freebsd.org/D39886
may be the culprit, as it appears to be the only non-trivial changes that could
affect my (amdgpu) configuration between the working and failing xorg-server
versions.

Attaching dmesg and Xorg.0.log for the working and failing cases.

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