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[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

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

Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released

Bug description:
  Background: 
  * in ubuntu 14.04 uxa was the default AccelMethod - switching vty takes nearly no time at all.
  * in ubuntu 14.10 sna is the default AccelMethod - switching vty takes 2-3 seconds and the screen blanks and then returns.

  By switching the AccelMethod back to 'uxa' in ubuntu 14.10 the 2-3
  second vty switch time goes away (becomes near instant again!). I am
  reporting this bug to ubuntu because I am not sure if it is xmir & sna
  related or not.

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