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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