[Bug 235635] vt video corruption when switching from xserver to tty

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235635

            Bug ID: 235635
           Summary: vt video corruption when switching from xserver to tty
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: nixuser1980 at gmail.com

On i915kms, vt(4) is shown to have corruption as per the attached image in the
top left of the display resulting in some unreadable text.

Steps to replicate:
As a regular user, run startx
Press Alt-Ctrl-F? to switch to a tty
Corruption is seen on top left of the display.

This issue can be intermittent and also affects 12.0 RELEASE on the same
system.

Machine is Lenovo T480 with integrated graphics from Intel.

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