It was a deliberate choice made to prevent information leaking from the
Xserver on VT switch. You need a recent kernel as well as a recent ddx
to only disable the planes on the CRTC, not the whole CRTC. This should
be ready in vivid.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1397492

Title:
  intel driver with SNA as AccelMethod SNA has slow (~2-3 seconds) VTY
  switch time

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