[Bug 245837] Switch from vga to fb on console fails after t359957

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245837

            Bug ID: 245837
           Summary: Switch from vga to fb on console fails after t359957
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rkoberman at gmail.com

After a recent update, my system locked up when attempting to switch from vga
to fb. The screen and does not ever proceed. Since the network is not yet up
and the system is still single user, I have been able to get more information.
I bisected to find that 359957 was the culprit.

If is possible that this is a drm issue that was hidden before this change, so
I will post a note about this to x11. I have seen reports on x11@ of problems
with systems locking up with blank screens, so this might tie into those.

My system is an old T520 with Sandy Bridge GPU.

Let me know what other information I might be able to obtain.

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