[Bug 261440] vt newcons breaks suspend/resume for all graphics cards that do not use KMS drivers

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261440

            Bug ID: 261440
           Summary: vt newcons breaks suspend/resume for all graphics
                    cards that do not use KMS drivers
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: sblachmann@gmail.com

vt newcons breaks resuming from S3 suspend for all graphics cards except those
being supported by i915kms, radeonkms and amdgpu.
Screen is black at resuming.

With sc resuming works just fine.
It does not matter whether the open-source freedesktop drivers are being used
(pre-radeonkms ATI graphics cards, Matrox, S3, ...) or the proprietary nvidia
drivers, sc handles them well, unlike vt.

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