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On 2015-10-14T09:40:09+00:00 Robert Ancell wrote:

On Intel systems when the X server exits the display is turned off and
remains off. This is triggered when using LightDM and switching to a
greeter (starts a second X server) then authenticating in that greeter
and returning to the first X server (the greeter X server is stopped).

The cause seems to be a DPMS change from bug 90179 (revision
7d9a74622e5a936e4860fcef8358619bf59adae8) that causes the driver to turn
off the output if DPMS is not working.

Tracked in Launchpad:
https://bugs.launchpad.net/bugs/1501941

Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1501941/comments/10

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On 2015-10-14T09:40:40+00:00 Robert Ancell wrote:

We are currently working around this issue in Ubuntu 15.04 by reverting
that one commmit.

Reply at: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
intel/+bug/1501941/comments/11


** Changed in: xserver-xorg-video-intel
       Status: Unknown => Confirmed

** Changed in: xserver-xorg-video-intel
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1501941

Title:
  Screen turned off after X server exits

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