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 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1397492 Title: intel driver with SNA as AccelMethod SNA has slow (~2-3 seconds) VTY switch time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1397492/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp